Partial derivatives | Multivariable Calculus | Khan Academy

[@xinrenwang7768]

This guy deserves a better computer

[@riccardoossanna8170]

dude just glance @ the upload date smh

[@tushar12345]

“... And get this man a computer!”

[@khanacademy]

You are right. I had graphed x2+y2 first and then typed in x2+y but forgot to refresh the graph.

[@billiondollarbull]

I have 36 hours to know everything. Lord help me.

[@wangchul]

i have little bit more than 36 hours should i feel lucky

[@vsh1998]

I have 45 mins...

[@442277100]

I have around two years.

[@rohitbhosle6521]

I just want to know it as quick as possible

[@beedy0]

@@442277100 TIME'S UP

[@thelemur]

help on rememberring right hand rule: remember that the thumb is "k", by the "ok" gesture, where u use "thumbs up". remember the index finger as "pointing at someone, while saying "I disagree on...:" and make som sort of picture in ur mind of that instance... And be crative, and remember the middle finger, by some other gesture, and link it with the letter "J", maybe a name or something... :)

[@ViktorLox]

This guy is an unsung hero! I took engineering this year, and I relied massively on these videos. Next year I'm switching to particle physics and I assume I'll be on here even more.

[@Soymilllk]

So good! i've been doing partial derivatives all semester and having NO CLUE what they actually ment. This video has finally given me a visual understand of what a partial derivative actually is! thank you so much sal!!!!!!!!!! i love u

[@omerzaman2373]

After watching this video all I can say is Thank You.

[@AndrewEG]

Sal your a fantastic teacher! thank you so much you helped me get into Mechanical Engineering!

[@paweborkowski4669]

Sal sounds so excited in this video! :D

[@RMRockstar]

this video really clarified all misunderstanding of this subject....thanx!!!! i will be watching all your videos as part of my study methods from now on

[@ASeeling]

This video was amazing. Thanks!

[@milkdrinker7]

so I guess they were running low on pixels in 2008?

[@carlofthemountain1598]

TheBlapman you’ll never know the pain

[@Marcinkonys]

This is big help. Thanks!

[@davidkippy101]

This is much more intuitive than I thought it would be.

[@romanglushenok5631]

Good explanation to get some intuitive understanding. Thank you! P.S. The surface you show formed by z = x^2 + y^2 equation.

[@canyadigit6274]

I understand everything now. Thanks, Sal.

[@marinasjoy]

You're a great teacher! Thank you. Also, nice voice.

[@humanshapedblob]

best opening of a khan video ever

[@rythmgangsta]

Keep these videos comming...you are much more interesting than my boring lectureres..helping me a lot !! Thanks !! :)

[@aadeshnikam2643]

I'm watching this in 2020.. Found it very useful thank you very much ❤❤

[@Sarika428]

0:33 that's an understatement!!!!!!!!!!

[@fermixx]

really cool ! the graphic made it way easier to understand. going into 3d is a whole other thing, and my book doesnt seem to like putting some drawings..

[@larus1655]

Extremely well done. You made what is typically thought of as an abstract concept, highly relatable. Thanks for that.

[@alexanderm2220]

This is a great video, everything is so much more clear for me

[@abhijitganguly5339]

mr.khan,you are a really good teacher!

[@kristoferson16]

awesome job man, you jus made that soo simple for me ; )

[@josepaul2000]

Its more like "everytime x increases by 1 at that particular point where the gradient is 0.7, i.e. point (0.2,0.3), z increases by 0.7 since the gradient is 0.7" but if the point were different, as you said for example; "everytime x increases by 1 at the point (2.5,0.3), z increases by the different slope, or gradient, that you got"

[@_seventh_son]

"need to give the slope a direction" always super intuitive sal. Never change

[@smolboyi]

this is too well done Salman

[@imegatrone]

I Really Like The Video From Your Introduction to partial derivatives.

[@chekurihrishikesh9022]

Great ....well understood. Thanks

[@samuuuJOEL]

Hey, I really like this explanation! Good job! But I want to point out that there should be a prime notation in f x (x, y). => f' (x, y) which actually means taking the partial derivative of the function w.r.t x!

[@thegoodkidboy7726]

Amazing how we lose track of how quickly technology advances.

[@nicholasproietti871]

You teach better than my professor! Thank you so much!

[@s.akhtar1308]

Is there any option to hide your comment? I am afraid yur professor might see it

[@RKO36]

[@qrrak]

thank you for your fantastic job Salman Khan. God bless you.

[@Arrow9100kj]

Great video as usual Mr.Khan! Don't forget to leave the link for the plotting freeware =D!

[@aadimalik8579]

Love u sal"i have been watching your videos since a year ,i love the way u describe anything,u make people understand "why things has to be the way they are!i'm in that part of the world where we are under the power of indian people they make us strive even for a job ....i don't t us all about doung j

[@DzSchuur]

Thank you very much for this video!!

[@florentinosanchez3969]

Best video in youtube

[@ny1fanta]

we should all donate money khan so he can buy the fastest computer in the world, he deserves it!

[@lizedcristinaromeroortiz1673]

Gracias por los subtítulos!! Desde Perú.

[@abruptcall]

I was very impressed by your video. Thanks.^^

[@rastovicfilip]

Thx, helped me visualise it

[@TheVopepigota]

Beautiful, lovely, lucid...

[@VeryFatFishh]

thank you !

[@dragos6625]

4:50 Can't that be called the secant plane?

[@Mrelevatorman]

Wow! That was very well explained. Thank you!

[@florentinosanchez3969]

Really nice video

[@piotrlenarczyk5803]

If you have a "single point" 4D, a derivative will be a 3D space ( using unit vectors could be helpful ). Think as a set (4D) of films (3D) made of pictures (2D) with lines (1D). In my opinion that is quite easy way to explain a multidimensional spaces ( 5D as a surface of 4D, and so on).

[@Mikmacer]

amazing explanation, thanks for doing this !

[@polyrhythmatics]

This was awesome!!! Thank you.

[@Maikkeru]

What is the name of the Java app that Sal uses? Anyone??

[@melissaquesnel1603]

type in your equation on google and it gives you a 3D interactive diagram

[@sonic41592]

Hey, can you please make a video explaining how to find the equation for a tangent plain at a point on a surface?

[@DrunkWhiteGuy]

Your students must like so much to have you as a teacher.

[@rotflmaopmpqxyz]

Is there a such thing as a tangent surface? like a plane that touches the one point you're looking for?

[@wolterh6]

hey @khanacademy did you post the link to the plotting app?

[@FAEM-ji5rv]

what is the link to that free 3d graphing programming?

[@wilfredkenyagah8238]

I like this, thank you so much

[@Bear7747]

Great video!

[@Bearkiller777]

what is the link to the java grapher you are using? I am in a calc.3 course I would like to know. please send ASAP thanks great vids explain things really well.

[@TomOoh1406]

Thank you so much. it helps me alot :) Great job. my favorite channel on youtube >>Khan Aca

[@qualquan]

Better than later versions by Grant though the R hand rule was superfluous.

[@cram2481]

2:51 "...But let's get to the meat and potatoes".

[@ethanjensen661]

3 Blue 1 Brown

[@TrueRaz]

You said that you would post the link to that java graphing app. Can you please do that?

[@therealjordiano]

so helpful :O

[@omarayman5318]

at 11:03 , Does you mean 45 degree with respect to x axis or not ???!

[@lulom8449]

the surface shown is actually z = x^2 + y^2

[@blubberinghumdinger35]

Thank you Sal, you're awesome :D

[@SinghTheMaster]

hello dear sir, Could you tell me which sofware are you working to draw all these things. thankyou

[@abhinavrathor440]

Colourful 3D graph was nice.what is the name of that software??

[@zuesr3277]

You can try Desmos or the Wolframalfa.

[@govindsingh3963]

Mathematica

[@Shaneyyy23]

love it.

[@superpurplemonkeyfly4115]

Hey, can someone please explain why the variables have to be independent in partial differentiation?

[@anonymoustraveller2254]

SuperPurple MonkeyFly because if so then there will never be any surface so no need there is only one variable changing & the problem will become two dimensional.

[@caoutchoucmilisec]

the name of the free plotting software please? thank you for your effort

[@badhonnuruddin]

i guess these videos are pretty old, 2008, when Khan used to do part time 'khan academy-ing'

[@DeltaAccel]

Casually, I got the link some weeks ago from my teacher. I'm not completely sure it's the same as the one Sal's using, but it's also a graphing Java applet. Got to imaginary org and in the "Programs" section look for 3D-XplorMath

[@asemnafiz]

Once again Sal Khan to the rescue!

[@TheTanman1234543]

Alg. 2. Im probably never gonna get this far in math

[@Internume]

I don't find a video on libsitch fonction :(

[@muhsinatoure51]

a great video

[@dareenkittaneh3570]

.98

[@dareenkittaneh3570]

.98

[@a1malik]

Salman Bhai ap konsa software use kar rahe hain graphing kay liye?

[@HexBlex]

"Everytime x increases 1, Z increases by 0.7" That's the only part I don't get. You plugged (0.2,0.3) into the formula and got 0.7 which is the slope of the tangent line at (0.2,0.3) which I agree with. However, I don't get how the conclusion that every increase in the x of one unit will result in a z increase of 0.7. If I plug (2.5, 0.3) I get of course a different slope. Can you or someone please clarify what was said?

[@MisterTutor2010]

The thing harder about partial derivatives vs. ordinary derivatives is writing the d's. The look like backward 6's :)

[@pasagadugulaappalaswamy5247]

Super

[@ERol-du3rd]

If you're looking for a quick review, start at 7:22.

[@TheYegens]

“Let’s get to the meat and potatoes” 😂😂😂

[@nsoper19]

there is a mistake at 8:23. the transcript says "what's the derivative of 2x with respect to x? well it's just 2x".

[@zeeshan3dge]

i like your "I don't know"

[@teejmd91]

let's get into the meat and potatoes

[@GreatVgnc]

wheres the link...

[@cziegl3r]

I luv calc and I love khan.

[@tufail1823]

Cory Ziegler Watch the movie My Name is Khan

[@nelsonluciano59]

Hi, if anyone know how to solve this please tell me. i really need to find the answer X is an natural number 2x is a perfect square 3x is a perfect cube 5x is a perfect 5th power Find X.

[@sriramaniyer9415]

let X=2^m * 3^n * 5^o 2x = 2^(m+1) * 3^n * 5^o . . . continue up to 5x then try to find LCM between the powers. I'm also trying.

[@olliesjollies68]

"whats the derisive of 2x with respect to x, well its just 2x" umm actually its should be "whats they derisive of x squared with respect to x, well its 2x

[@androideart]

My friend, .2 x .2= .04

[@14cheetah14]

AWESOME AWESOME AWESOME AWESOME AWESOME AWESOME AWESOME ... Awesome^(awesome^4) Thanks.

[@luvsingin6]

yum, meat and potatoes

[@WontonSandwich]

11:11 !!!

[@macmos1]

toothpick life.

[@aS0yCz8H7Fy4SAG]

@TheTanman1234543 it's all baby steps you'll get there eventually