L'hospital's Rule Indeterminate Forms, Limits at Infinity, Ln, Trig & Exponential Functions Calculus

  Рет қаралды 1,223,625

The Organic Chemistry Tutor

The Organic Chemistry Tutor

Күн бұрын

Пікірлер: 458
@TheOrganicChemistryTutor
@TheOrganicChemistryTutor Жыл бұрын
Derivative Applications - Free Formula Sheet: bit.ly/4eV6r1b Final Exams and Video Playlists: www.video-tutor.net/ Calculus 1 Final Exam Review: kzbin.info/www/bejne/jZ6lq6B-p9pqbtk
@r.m.9800
@r.m.9800 7 жыл бұрын
It really upsets me that I'm paying actual money for classes just to find myself back on youtube... This man deserves my entire tuition.
@Sam-rw4nx
@Sam-rw4nx 7 жыл бұрын
Regan M it’s so upsetting to me too like wtf why can’t I just pay for the textbook and take the tests, I do more work than the teachers tbh don’t even need them if they’re not going to help like this
@imrickiee4651
@imrickiee4651 6 жыл бұрын
I agree with you!!!!!!!! my professor is SUCK : ) AND WASTE MY TIME
@Bandit-mo9qx
@Bandit-mo9qx 5 жыл бұрын
@@imrickiee4651 say hi to suck for me
@MelonMediaMedia
@MelonMediaMedia 5 жыл бұрын
dw, hes getting paid for u looking
@nabarajbaral2063
@nabarajbaral2063 5 жыл бұрын
@@Bandit-mo9qx Evaluate:lim x tends to 3 x^2-8x+15/x^2-2x-3
@maahasgharali571
@maahasgharali571 7 жыл бұрын
Idk how to thank you sir. I have been watching your videos for almost a year now. You are one of the best tutors on KZbin I have seen so far. I wish I could meet you in person and tell you how grateful I am to you. I always wished that someone should make one video to cover multiple topics.... I wanna tell you that now when I don't get the way my prof teaches which is almost always... I don't panic because ik that your videos are there. But when I can't find a topic on ur channel (that is almost never) then I start to panic. THANK YOU SOOO MUCH SIR for making billions of students' life easier. We honestly can't thank you enough. And please keep up the great work...your efforts are being appreciated 😊
@TheOrganicChemistryTutor
@TheOrganicChemistryTutor 7 жыл бұрын
You're very welcome. Thanks for the comment.
@yamkelaniking8380
@yamkelaniking8380 4 жыл бұрын
@@TheOrganicChemistryTutor He Replied :)
@Kevin_Cohen
@Kevin_Cohen 3 жыл бұрын
Subscribe to his Patreon to show ur support :)
@baslealdereje5369
@baslealdereje5369 2 жыл бұрын
What JG replied🙃🙃🙃
@NicaKasende
@NicaKasende 4 ай бұрын
​@@TheOrganicChemistryTutoryou're an amazing tutor!!! I always recommend my classmates to you!
@skiidzman
@skiidzman 6 жыл бұрын
Some people are born to teach. I don't care what anyone says, this guys video here is brilliant, and easy to understand. His videos on thermodynamics are equally as helpful. Thank you man. Subbed for life... b/c you helping me get my career.
@lunavelez1752
@lunavelez1752 3 жыл бұрын
as a future astronomer, I'll name a star after you since you've helped me so many times with my tests :( university is hard man
@anyangoobara9166
@anyangoobara9166 3 жыл бұрын
I love this 🥺
@berrycool2217
@berrycool2217 3 жыл бұрын
Whats your sign? Im a Virgo!✨✨
@12345pwill
@12345pwill 3 жыл бұрын
@@berrycool2217 astronomer, not astrologist
@Druufus
@Druufus 2 жыл бұрын
@@berrycool2217 LMAO
@blitziam2105
@blitziam2105 2 жыл бұрын
@@12345pwill HAHAHAHHAAAAAAAAAAAAAAAAAAAAAA
@michiganmitten1147
@michiganmitten1147 4 жыл бұрын
During this global pandemic covid-19 my math class was moved online and watching these videos have saved my life
@nurul2711
@nurul2711 4 жыл бұрын
omg same!!!
@MA-jq8zr
@MA-jq8zr 3 жыл бұрын
same but i think i would need it either way
@sjwdestroyer6336
@sjwdestroyer6336 7 жыл бұрын
Who else is going to end up owing half their degree to this guy?
@matthewramirezdipietro8221
@matthewramirezdipietro8221 5 жыл бұрын
me
@shukkkursabzaliev1730
@shukkkursabzaliev1730 5 жыл бұрын
Yep, that's me)
@GM.Nobody
@GM.Nobody 4 жыл бұрын
Degree? Im in high school
@lynniela4679
@lynniela4679 4 жыл бұрын
I am😪
@aniketmukhia8355
@aniketmukhia8355 3 жыл бұрын
My bachelors degree
@griffinpeterson5513
@griffinpeterson5513 7 жыл бұрын
i wanna let you know ive been wathcing your videos for about a week now, by far best tutor on youtube. Better than any math teacher i have ever had by far. I've learned and mastered more of the topics in this last week than in my whole calc class and i wish i would have figured out about you sooner. You deserve million subs
@Goldenrose137
@Goldenrose137 Жыл бұрын
Are you alive 😊💔💀
@farhannoor3935
@farhannoor3935 4 жыл бұрын
this man is without a doubt the saviour of STEM majors. Saved my Single Variable Calc. minor course grades under this channel. massive respect to this man.
@vladimirmakarov9548
@vladimirmakarov9548 7 жыл бұрын
All hail king of physics chemistry and mathematics
@ut6582
@ut6582 3 жыл бұрын
Aka The Main Subjects
@anudeepannangi9813
@anudeepannangi9813 4 жыл бұрын
You're the BEST tutor ever!!! I have an A in calculus because of you! I wouldn't be passing calculus without your videos. Thank you so much!!
@mohammadmunzurulhaque3197
@mohammadmunzurulhaque3197 5 жыл бұрын
I have a wish. I want to meet you in person one day and just say , " Thank You "
@josphellihsilak4588
@josphellihsilak4588 5 жыл бұрын
I hope you're making damn good money from this channel, because you have some serious teaching skills.
@duduzilesithole760
@duduzilesithole760 3 жыл бұрын
YOH BRO I A MA 1ST YEAR AND THIS GUY IS THE BEST HE HAS SAVED ME SO MANY TIMES WHEN I THOUGHT I WAS NOT GOING TO GRASP EVERYTHING AND HAD TO WRITE A TEST THE 2ND DAY
@edo8797
@edo8797 9 күн бұрын
That lny example at 55:51 was crazy. Once you understand what to do and why you do it’s beautiful to connect everything together , but I don’t know how I would figure this out myself on an actual exam. Like what to apply and when to apply it, seems easy once you look at the solution but man, picturing myself solving this alone, figuring out exactly what to use and when to use it seems unimaginable. I guess that’s exactly where the beauty of math lies, and I think that after many exercises anybody could be able to figure these things out alone, and I for sure need TONS of practice. Thank you by the way, you are the best math teacher on the web.
@charleschiemekaekeogu6908
@charleschiemekaekeogu6908 4 жыл бұрын
Thank you, you're the reason why I am passing most of my classes. Organic chemistry, Calculus, and Physics. Man, I only wish I can meet you to personally thank you.
@richardmartes6837
@richardmartes6837 6 жыл бұрын
You don’t even have any idea how many students you’re helping. Thank you so much for your videos.
@rodericksibelius8472
@rodericksibelius8472 11 ай бұрын
Learning from You Maestro from all your KZbin science and mathematics Teaching SAVES me from going to the 'Mental L'Hospital' from all the confusion, psychosis of learning the ways of doing 'CALCULUS' of any form. Thanks.
@sofiamalik8835
@sofiamalik8835 3 жыл бұрын
I am really thankful and grateful that professors like you exist.Once i hear your voice ,its confirm that i will easily understand the topic.Once again thank you for your efficient and proficient teaching methods.👍
@uygarbaran8515
@uygarbaran8515 6 жыл бұрын
My test is in 40 minutes and I am watching this just to make sure I got everything haha you are #1.
@rafiulhaque9139
@rafiulhaque9139 3 жыл бұрын
31:30 _lim_ f.g→f/g⁻¹ 42:38 _lim_ a-b→(a-b)(a+b)/(a+b) 55:40 _lim_ (f)ˣ→ln(y)= _lim_ x.ln(f)
@mollyyu7224
@mollyyu7224 2 жыл бұрын
pre exam noted. thank you
@lance4377
@lance4377 Жыл бұрын
Base e both sides to eliminate ln in ln y
@rayanshaikh7271
@rayanshaikh7271 Жыл бұрын
in the first formula, doesnt that contradict the power rule? f.g = f’g + g’f ???? which one are we meant to use
@zibajanazizi6566
@zibajanazizi6566 4 жыл бұрын
I had thought that our university’s math teacher is intelligent and he can teach well But no I’m sure that 100 percent I was wrong I thing there would be no one better than you The way that you thought was really fantastic Thanks sir really really thank you May Allah give you long life ♥️
@razabazal4669
@razabazal4669 5 жыл бұрын
I have been saved so many times by this genius
@monijehkhojaherawi8449
@monijehkhojaherawi8449 6 ай бұрын
Does his voice bring anyone else a sense a calm as well? Like my professors voice traumatizes me but his voice just brings me peace because I know by the end of the video I WILL know the topic. As opposed to lecture by my professor is a stress induced gamble.
@yatsumleung7181
@yatsumleung7181 5 жыл бұрын
you are honestly amazing. thank you so much for your videos. you got me through pre-calc and calc. honestly i used to hate maths because i used to find it confusing and hard to understand. but you make your topics and videos very clear - your videos saved me lots of stress and tears. it has helped me build my confidence in mathematics and i cannot thank you enough. also, when i took my SATs, i watched the entire SAT math playlist you created and felt really confident. you are an actual legend. i also watched your cellular respiration and photosynthesis video for ap bio!! very good!! more people need to watch your videos, especially people who hate math because they find it impossible to understand. when my friends and i don't understand what our teacher is talking about, i always tell them to go watch julio gonzalez or the organic chemistry tutor!!!
@Anything13265
@Anything13265 10 ай бұрын
i always read comments of other people thanking you for saving their grades, and today i get understood them, thank you i owe u big time
@sadafinam3859
@sadafinam3859 3 жыл бұрын
I just love how when I watch your video and my related lecture slides automatically start making sense. ❤❤💯💯
@intkayne736
@intkayne736 4 жыл бұрын
I need you as my college tutor..you teach so well ......😌cause I came out of the same class thinking that my life ended cause I had understood nothing ...but here I am suprised of how much this topic is actually doable👏👏
@fariba_0_0
@fariba_0_0 Жыл бұрын
You know I don't even listen to my professor in my math class because I understand nothing! I just watch your videos after my class, and I got all A for my math classes. Thanks to you!
@jimyjamal7353
@jimyjamal7353 3 жыл бұрын
you know what i dont care if i need to see the whole ads. because you are the one that help me to understand this whole topics
@ashnahkhalidkhan2244
@ashnahkhalidkhan2244 4 жыл бұрын
Sir, you are my knight in shining armour (also carrying a bunch of books and a calculator and pen). Thank you so much for finally helping me understand
@Y.G.A.2022
@Y.G.A.2022 2 жыл бұрын
From yemen appreciate your work
@rob3217
@rob3217 2 жыл бұрын
The best math professor of any university!
@saviourmukuka2833
@saviourmukuka2833 5 жыл бұрын
Whenever I find your video I know it's gonna be a good video ...you are a life saver...
@garen1435
@garen1435 2 жыл бұрын
I have few words for this man an absolute legend made this chapter 100x easier then i was since my teacher is litterly trash thansk you a lot mate.
@lisselotmartinez4928
@lisselotmartinez4928 6 жыл бұрын
I just want to say that you helped me pass my first calc exam and I'm so thankful towards you.
@littlecritter5236
@littlecritter5236 3 жыл бұрын
i would totally go to an Organic Chemistry Tutor festival where we all just solve math problems together
@essraateah415
@essraateah415 Ай бұрын
Thank you so much. May Allah reward you and guide you and guide all of us including me of course.,,,, Dude this tutor is amazing!!!!
@tshamanogiven9380
@tshamanogiven9380 4 жыл бұрын
I can just pass the exam without attending classes after watching this guy, he is the best
@96Marshmallows
@96Marshmallows 5 жыл бұрын
You go through the questions at a lovely pace. Not too fast nor too slow.
@qifanyang404
@qifanyang404 4 жыл бұрын
Thank you so much! I've never been so confident in Calculus!! Grateful!
@ashleypippin3239
@ashleypippin3239 4 жыл бұрын
Just want to say THANK YOU! Your videos have helped me so much with the chemistry and calculus classes I'm taking right now.
@woozihae
@woozihae 2 жыл бұрын
This guy is the main character in this world and we're just side characters. What a holy teacher.
@azaa2188
@azaa2188 9 ай бұрын
MY NOTES: When larger no. at bottom/denominator, then answer will most likely = 0 Anytime you have a constant (on numerator) divided by ∞, then answer will = 0 8:55 Looking at the degrees of either numerator or denominator, can help get to the answers - When denom. has degree(e.g. x^3) higher than numer.(e.g. x^2), the func. will be bottom heavy --> answer = 0 - When numer. has higher degree, then func will be top heavy --> either + ∞ or -∞ - When numer. and denom. has same degree ---> answer will equal to a constant 12:40
@audreyhoo4249
@audreyhoo4249 Жыл бұрын
Thanks!
@moosegoose1282
@moosegoose1282 5 жыл бұрын
lol my test is in 3 hours.
@morjithmattapalli9531
@morjithmattapalli9531 4 жыл бұрын
My test is now and that too in online *This is the only way*
@Hello_am_Mr_Jello
@Hello_am_Mr_Jello 4 жыл бұрын
How it was
@opz0diac
@opz0diac 4 жыл бұрын
$20 this got u an extra 15%
@Azakadune
@Azakadune 4 жыл бұрын
What u get?
@noaln1697
@noaln1697 4 жыл бұрын
Ha Amatuer! Mine is in 1 hour!
@clivemadimutsa
@clivemadimutsa 3 жыл бұрын
Ignorance can be educated but not stupidity this tutor is very crucial to mi i got the concept and how to solve the problems i'm facing in my life .GOD bless this tutor i really appreciate wat they give us .
@beamishjames
@beamishjames Жыл бұрын
Can't tell you just how much I love and appreciate your videos!!
@sofialordello4834
@sofialordello4834 Жыл бұрын
Thank you so much! I was able to learn more in 10 minutes of your video than multiple 1 hour lessons!
@TendaiMukajami
@TendaiMukajami Жыл бұрын
You are just the greatest teacher of all time (goat)
@SirGabeII
@SirGabeII 3 жыл бұрын
Thanks brother! Our educational system is incompetent, so we are in absolute need of people like you!
@JO-ej3nh
@JO-ej3nh 7 жыл бұрын
You are one of my favorite instructors on KZbin. You helped me pass Chem 201.
@Yami278
@Yami278 7 жыл бұрын
I thank you, you helped me pass my chemistry class.
@gartyqam
@gartyqam 4 жыл бұрын
@@hermanmusimbi4337 deez nuts chemisry
@From.the.river.to.the.sea23
@From.the.river.to.the.sea23 4 жыл бұрын
I know this guy since 2018 he is the main source i use study for college. My gpa is 4.8 so far
@From.the.river.to.the.sea23
@From.the.river.to.the.sea23 4 жыл бұрын
To study *
@brenda7577
@brenda7577 Жыл бұрын
With you math isn't that hard anymore, you make it interesting, thanks
@Kvs6263
@Kvs6263 3 жыл бұрын
nice video i learned a lot in the middle of arcane bathroom break!
@mr.thunderff4727
@mr.thunderff4727 2 жыл бұрын
This man is god gifted bro respect
@issachernandez1828
@issachernandez1828 6 жыл бұрын
You should be a tutor. These videos are great!
@manjeetshrestha3544
@manjeetshrestha3544 6 жыл бұрын
You teach way better than what my teacher teaches
@fireemblem2770
@fireemblem2770 4 жыл бұрын
If people are honest in saying that they owe their course amount and/or tuition to JG, then this man is about to be a millionaire. Because so many people have come back to him. time and time again.
@russellerocido7897
@russellerocido7897 3 жыл бұрын
Im seriously thinking of paying any reclaimed tuition i would get (if any) forward to this guy's patreon
@monjiques1147
@monjiques1147 2 жыл бұрын
We love you OCT! You my hero! 🥰
@sarcaastech
@sarcaastech 8 жыл бұрын
ok thank you so much sir... u are doing a great job.. # Respect..
@francismiwube6186
@francismiwube6186 2 жыл бұрын
You deserve to be applauded 👏👏👏
@rejibaby2007
@rejibaby2007 6 жыл бұрын
Excellent video. Explained every step of these problems very clearly.
@davidmanzi9841
@davidmanzi9841 7 ай бұрын
Who is here in 2024 after 7yrs
@NatoMoloi-jc1tx
@NatoMoloi-jc1tx 5 ай бұрын
Me😂
@xXHollysoxXx
@xXHollysoxXx 6 ай бұрын
I’m taking calc for the first time this semester, and as someone who is studying to be a math teacher I find myself becoming more and more critical of my professors and how they choose to teach. I feel like the reason your videos work and many classes do not is the air of judgement carried by many math teachers I have met. In your videos and comments, nobody fears being embarrassed in front of an entire class (which in uni, could be hundreds of people), and the community that follows you genuinely wants to spread helpful information as opposed to having the stack overflow mindset of “figure it out yourself”. Additionally, pretty much every major college class is fated to be mainly lecture in style despite this being an empirically awful way to teach and very ineffective. The only reason we have lectures is because it’s easier for the university or college to schedule in that many people and it is difficult to manage hundreds of people at a time. However, in my opinion this does not excuse the blatant disregard of educational science in an educational institution for the benefit of convenience to the entity. We pay THOUSANDS of dollars to go to school, this is unacceptable. Your videos are different from lectures, even when they become lecture length. They are interactive and straightforward, allowing us to follow along by our own direction or simply just listen to the logic on our own terms and therefore increasing our ability to understand these concepts. Like I said, I am studying to be a teacher and so I find myself thinking of these things more and more. If you are a college student as I am right now, I want you to consider using your voice to your university to insist on better teaching standards for our higher education. It’s sad that professors are memed to be lazy, uncaring, and ineffective. They are literally the last line of education teaching the hardest and most advanced topics, we can’t afford for them to be this way. I have loved this channel forever and recommend it to everyone I meet in school, but it is sad that so many of us feel that our professors are not teaching up to expected caliber of a college professional. There is a lot of talk about student responsibility in college, but this is more and more being used as an excuse to ignore student feedback even when it aligns with what we scientifically know to be true about education. Use your voice.
@azipage
@azipage Ай бұрын
this is super helpful, thank u so much. having a calc exam in an hour :)
@BlackStar-jo2pu
@BlackStar-jo2pu 4 жыл бұрын
You deserve more subs. Period.
@erinkylecordero
@erinkylecordero 4 жыл бұрын
wish degrees wouldnt mean so much in my country, damn. I'd graduate with these videos, I basically learn more with them anyway
@yousufparvaiz3548
@yousufparvaiz3548 2 жыл бұрын
BEST TEACHER EVER
@From.the.river.to.the.sea23
@From.the.river.to.the.sea23 4 жыл бұрын
I really mean no offense but when I cannot : 1 understand a point in math 2 fall asleep I watch you nonstop You have nice voice and great knowledge.
@amyfarrel4374
@amyfarrel4374 2 жыл бұрын
hi, if i was working i would have love to pay money to support you. you're a great teacher.
@FawadKhan-co6le
@FawadKhan-co6le 7 жыл бұрын
You are very good teacher i like you
@asoup1972
@asoup1972 2 жыл бұрын
The example at 35:02 really helped me out. Thanks!
@Earlx3n
@Earlx3n Жыл бұрын
I pray you see this... Since f.g= f/1/g How do i know which function is Which?? Like is there a specific Way to substitute them; its really confusing cause i always get the wrong answer if i sub them the other round Please helpp
@essraateah415
@essraateah415 Ай бұрын
49:17 this question is full of tricks and ideas to deal and play with functions in order to find the limit,, just saying in case of somebody is interested in this kind of questions,, this question needs a clear mind,,, of course our organic chemistry tutor explained it in a creative way
@tsegakagnew6442
@tsegakagnew6442 4 жыл бұрын
😭😭😭😭 I am eternally grateful to u.....
@saratesfaye823
@saratesfaye823 2 жыл бұрын
May God makes u happy for ur entire life Sir ...
@samuelkibet8031
@samuelkibet8031 4 жыл бұрын
I rather attend your lecture than current one
@Masterofminds12
@Masterofminds12 Жыл бұрын
You teaching are very impressive
@Timmy16-
@Timmy16- 5 жыл бұрын
25:37, he made a mistake by saying that cos 0 is -1 but it's simply 1 and the fraction would then be 0/0 which allows us to use L'hôpital's Rule
@bonamonisandeepkumar3650
@bonamonisandeepkumar3650 4 жыл бұрын
π=180,so Cos(180-0)=-cos(0)=-1
@oluwaFaith
@oluwaFaith 5 жыл бұрын
Wonderful. Thank you so much.
@FILEXBWIRE-r5o
@FILEXBWIRE-r5o Ай бұрын
Actually you have mathematicaly enlightened our mind set😢😮😮❤😊😅😅😮😮😮
@IvyANguyen
@IvyANguyen 2 жыл бұрын
Thanks for this video. It has served as a good review of L'Hospital's / L'Hôpital's Rule.
@5gallonsofwater495
@5gallonsofwater495 Жыл бұрын
Thank you so much man, with this knowledge that you have provided me, I will now be able to pass midterms (hopefully).
@amirk27
@amirk27 7 жыл бұрын
Thank you so so much GOD Bless you get lots of help.............
@voltvision123
@voltvision123 8 жыл бұрын
Thank you for making this video, it helped me out alot! Even though my native language is not English it was very clear and understandable.
@Alhaj_Muhammad.
@Alhaj_Muhammad. Жыл бұрын
Thank you I really appreciate your efforts.
@sharon_isking
@sharon_isking 2 жыл бұрын
Nobody else does it better than you do it.
@saranpakhan4954
@saranpakhan4954 4 жыл бұрын
You are helping man... Thanks so much...💯👍
@ÖZGEŞAHİN-j3x
@ÖZGEŞAHİN-j3x 21 күн бұрын
great work I adore you so much.
@yomnaabubasha4275
@yomnaabubasha4275 3 жыл бұрын
very thankful for your videos 🙏🏽🙏🏽
@dennisa.germino8103
@dennisa.germino8103 5 жыл бұрын
This man is God's Gift!
@suleyz01
@suleyz01 5 жыл бұрын
ı did not attend a single class at school, ı hope ı will pass todays exam..... thank you for the video!!
@Veer1516
@Veer1516 5 жыл бұрын
Thank you man you helped me pass ap math
@macwoods8011
@macwoods8011 3 жыл бұрын
This man saves lives
@mikelboudica5389
@mikelboudica5389 5 жыл бұрын
9:30 amazing summary
@derekliu4917
@derekliu4917 4 жыл бұрын
thank you fine sir you deserve a like
@boredindeed9685
@boredindeed9685 4 жыл бұрын
I never watched a video that used top and bottom so much I am pleased😂
@buteranelly
@buteranelly Жыл бұрын
thank you for the help brother 🙏
Limits requiring L'Hopital's Rule
16:35
Prime Newtons
Рет қаралды 21 М.
L'hopital's rule
13:09
The Organic Chemistry Tutor
Рет қаралды 2,3 МЛН
Жездуха 42-серия
29:26
Million Show
Рет қаралды 2,6 МЛН
Маусымашар-2023 / Гала-концерт / АТУ қоштасу
1:27:35
Jaidarman OFFICIAL / JCI
Рет қаралды 390 М.
UFC 287 : Перейра VS Адесанья 2
6:02
Setanta Sports UFC
Рет қаралды 486 М.
Limits at Infinity & Horizontal Asymptotes
19:24
The Organic Chemistry Tutor
Рет қаралды 1,1 МЛН
What staying up all night does to your brain - Anna Rothschild
5:37
Limit at infinity of exponential function
12:01
Prime Newtons
Рет қаралды 76 М.
Limits of Trigonometric Functions
15:23
The Organic Chemistry Tutor
Рет қаралды 2 МЛН
CALCULUS Top 10 Must Knows (ultimate study guide)
54:27
JensenMath
Рет қаралды 334 М.
How to Remember Everything You Read
26:12
Justin Sung
Рет қаралды 2,7 МЛН
Squeeze Theorem
10:43
The Organic Chemistry Tutor
Рет қаралды 1,1 МЛН
Understanding Limits and L'Hospital's Rule
9:12
Professor Dave Explains
Рет қаралды 308 М.