I have a heart attack whenever I see "integral" and "root of tan x" in the same sentence.
@darthsion38445 жыл бұрын
The two make a VERY deadly combination 😢😢😢😢😢😢
@CheapPhysics4 жыл бұрын
I have made this maaan!!!!
@PunmasterSTP Жыл бұрын
I think we all do 😥
@jackkalver4644 Жыл бұрын
Whenever you see sqrt(tan x), it often pays to use u=sqrt(tan x) to convert the problem to something manageable.
@yusuke855 жыл бұрын
1) double-angle formula 2) u=tan(x), x=arctan(u),dx= du/(1+u^2) 3) sin(x)= u/(sqrt(1+u^2)) and cos(x)= 1/(sqrt(1+u^2)) 4) inside of the integral is du/(2 sqrt(u)) 5) the result is sqrt(u)= sqrt(tan(x)) +C
@carlosabrill4851 Жыл бұрын
Nice substitution bud, I struggled a little with this problem, Even tried to use weierstrass substitution
@karangujar3177 жыл бұрын
Hey!Found the easiest method!Just divide numerator and denominator by (cosx)^2 and you are done :)
@blackpenredpen7 жыл бұрын
Ah ha!!! I see it now too!!! Thanks!
@LOL-rg8wb7 жыл бұрын
OH YEAH!!!!!!!!!!!!
@Aramil47 жыл бұрын
Karan Gujar you mean right from the onset? Can anyone explain? :/
@PawanKumar-kv4it7 жыл бұрын
Aramil4 writing sin2x as 2sinx.cosx we have √tanx /2sinx.cosx dx multiplying by cos^2x and simplyfing 1/2×integral sec^2/√tanx dx now just substitute tan=u
@glydon-w2w5227 жыл бұрын
Noob that's all the way same ...
@thanjavurvlogs130710 ай бұрын
Super explanation I caught but I used to leave c in sec x during exams😢😅😂
@StephenMarkTurner6 жыл бұрын
I did the same sub as Fabien (u = sqrt(tanx)), but only subbed for du, left everything else in the x world. It quickly simplified to integral of 1 du.
@RedIceberg Жыл бұрын
You could also just do a u sub with u=tanx, then convert cos^2x/sinxcosx to 1/u.
@eleazaralmazan40898 жыл бұрын
Keep making these integral videos! Your the best!
@Ravikumar-wy2dj5 жыл бұрын
You’re*
@themathworm49843 жыл бұрын
You can also do it by just applying the second formula of sin(2x)= 2tanx / 1+ tan²x ....and so on
@fabiengiudicelli14558 жыл бұрын
Thanks for all your vids. I just found an other way to integrate sqrt(tan(x))/sin(2x), you just have to do the u-substitution at the beginning with u=sqrt(tan(x)). I think it works, almost at the end you have u^2.cotan(x)du ; but u^2 is nothing but tan(x), give to integrate 1 in the u-world which equal to u + C , and u is sqrt(tan(x)), finally you have sqrt(tan(x)) + C.
@blackpenredpen8 жыл бұрын
That's brilliant! Thanks for the method!
@fabiengiudicelli14558 жыл бұрын
I am glad to read a compliment from blackpenredpen's teacher! I learn a lot from your vids so thanks to you, I am so grateful!
@faezwahid73548 жыл бұрын
fabien Giudicelli can you show me how you do by substitution u=sqrt tan x ??
@blackpenredpen8 жыл бұрын
In fact, I just did that on the other day kzbin.info/www/bejne/p4asYominrqGoq8 Thanks to Fabien
@fabiengiudicelli14558 жыл бұрын
Thank you Wahid for your interest, Blackpenredpen was faster than I to answer your question :) , a chance because his vids are very well illustrated, it is better than I could do. I wish a nice end of year to both of you.
@prollysine2 жыл бұрын
Gratulálok a feladathoz, a megoldás meglepő és mulatságos ! Szuper !
@prakhargupta37393 жыл бұрын
write sin(2x) as 2tan(x)/1+tan(x) and you can directly go to the last step
@Concordeagle5 жыл бұрын
That microphone though..
@timmurski20757 жыл бұрын
I love that your continuation arrows look like integral symbols. thank you for your awesome videos.
@blackpenredpen7 жыл бұрын
hahahah! thanks!!!
@zerospeed64126 жыл бұрын
If you had written sin(2x) in terms of tangent it would be as simple as sharpening a pencil.
@karandabas1283 жыл бұрын
Absolutely
@darkseid8565 жыл бұрын
It would have been Way easier if you expressed sin(2x) in terms of tanx Sin(2x) = (2tanx)/(1+ (tanx)^2). 1+ (tanx)^2 becomes (secx)^2 and goes on top . After simplifying we get integration of [(secx)^2 dx] ÷(2√tanx) And It can be easily solved by taking u=tanx. Solved in 3-4 steps .
@duduomer51494 жыл бұрын
It can be solved in one substitution: t =sqrt(tan(x)) dt=dx/(((sqrt(sinx)*(cosx)^(1.5))*2) integral(dt)=t+c=sqrt(tan(x))
@Akshushah_12054 жыл бұрын
You can also just apply Sin(2x)=2tan x / 1+ tan^2x and then 1+ tan^2x as sec^2 x and then we can just take tan x = u
@xyrokai63433 жыл бұрын
Say tanx = u² and sec²x.dx = 2u.du Do the substitutions it gives you 2u²/(2sinxcosx/cos²x) and then that makes 2u²/(2tanx) Tanx was u² So the original integral becomes simply 1 but in u-world. Take the integral and it gives you u + C substitute back and it gives you √tanx + C
@lohram44437 жыл бұрын
Hi, you could use parametric formulas for sine and cosine.... indeed you have t=tan (x/2), in this case when parametrizing sin (2x) you just have t=tan (x) and then can write dx=dt/(1+t^2).. check that.. makes it soo easy.
@hique67 жыл бұрын
A
@aeroflySL_2021 Жыл бұрын
Hi bprp! Stating straight with u = tan x is easier right cuz sin2x also can be written ofinterms of tanx then a lot cancels of?
@taranmellacheruvu2504 Жыл бұрын
You can start by doing the double angle formula for sin and dividing the numerator and denominator by cosx twice to get: int (sqrt(tanx)sec^2(x)/(2tan(x)))dx Then u=tanx gives you int(sqrt(u)/(2u))du which is sqrt(u)+c or sqrt(tanx)+c.
@tomatrix75254 жыл бұрын
These videos are unreal keep it up
@nonedone7 жыл бұрын
dude, that was thug life
@vitorsousa53902 жыл бұрын
That's interesting to note that this integral is an improper integral. With the integral function only making sense at a value different than zero, because the derivated function is not defined at x = 0
@МирославНачев-в4щ5 жыл бұрын
F(-sinx,-cosx)=F(sinx,cosx) => we can use the substitution t=tgx; sinx=t/(1+t^2); cosx=1/(1+t^2); dx=dt/(1+t^2)
@BRUNOLOPESDF7 жыл бұрын
Please, solve integral of sqrt(tan(x)).
@blackpenredpen7 жыл бұрын
BRUNO LOPES I did it recently!!
@gnsoares_7 жыл бұрын
kzbin.info/www/bejne/bKeTgqSAbZyamq8
@bojanglesfries2 жыл бұрын
guy's its simple. Just multiply it by sin(2x)
@Dharmarajan-ct5ld3 жыл бұрын
Why write such long solution ? Write sin 2x =2tan x / (1+tan^2 x). Cancel √tan x : note it is non zero. It is over in one step. Kindly consider
@rotemlv3 ай бұрын
The way I'd to it is by bringing it all to the numerator, after the double angle. sq(tanx) * cscx * secx, then multiply and divide by secx, split the two between the last two terms and you get (after u sub): sq(u) * (1 / u) * du Yeah yeah everything over 2.
@fourier07able5 жыл бұрын
On the board, after (1/2)*Int [sec^2 x/sqrt(tan x)]dx, all of the remain he wrote is unnecessary because of Int [sec^2 x/(2*sqrt(tan x))]dx = sqrt(tan x) directly since d/dx(sqrt(tan x)) = sec^2 x/(2*sqrt(tan x), the integrand!
@PunmasterSTP Жыл бұрын
That was some very nice manipulation 👍
@wallybaldemor85235 жыл бұрын
Just cancel the denominator. Voila
@ayushfirodiya60834 жыл бұрын
Put tanx = t^2 and just put values of sinx, cosx and sec^2x in terms of t . The whole equation gets cancelled out and you are left with integration of just dt. Found this easier method to solve this
@Lily-zd6dx6 жыл бұрын
i love his accent !
@keshavmurali987 жыл бұрын
Ah, I had a variation of this in my school textbook (sinx cosx in the denominator instead of 2 sinx cosx) and my brother told me the cleanest way was to substitute u^2=tan x I tried canceling like this, but I then got stuck after a few steps for some reason. Good to know it can be done like this as well.
@psykp9306 жыл бұрын
Your are a motivation, man! ❤
@chidhambaramgl51355 жыл бұрын
Nice bro...good work I like it bro...
@carlosabrill4851 Жыл бұрын
That's the problem I'm stucked on, it is from the Stewart's book
@Kanal2635 жыл бұрын
Isn't there an integral which you can't solve? I'm Always very impressed, when i See you solving the Most complicated integrals
@hemanthsirvi3 жыл бұрын
I was able to solve all of this in my mind without even using pen and paper
@pipertripp8 жыл бұрын
I just multiplied top and bottom by sqrt (tanx) right out of the gate. it gets you to the u sub setup in fewer steps. I like the clever algebra with sqrt(cosx) though.
@blackpenredpen8 жыл бұрын
Ah i see! thanks for sharing
@jessewon42267 жыл бұрын
Thanks for the lecture(integral obsession | integral of sqrt(tan(x))/sin(2x)). Do you mind if I ask you a question? Is there a shorter way to approach upon the SAT or real exam in Math class? Please let me know.
@shaunakkulkarni46796 жыл бұрын
Do what he does rly fast
@dagmawidemelash32098 жыл бұрын
You Have Helped A Lot. Thank You!
@miterun4 жыл бұрын
Actually sqrt(cos^2) = |cos|. Why this factor is ignored? Why do you take cosx? It is only one part of solution
@Tsskyx7 жыл бұрын
Hey wait a second, I thought the dx at the end of the integral had no meaning, and now you took it at 6:20 and did some math mumbo jumbo with it. I didn't know you could do that.
@GAMERCREEDbrickjet7 жыл бұрын
it does have meaning, you are multiplying all the integral stuff by dx
@Tsskyx7 жыл бұрын
Why?
@GAMERCREEDbrickjet7 жыл бұрын
watch 3blue1brown's essence of calculus. it has a great way of explaining this stuff
@Tsskyx7 жыл бұрын
I did watch that already. I don't think it answered my questions.
@GAMERCREEDbrickjet7 жыл бұрын
integral is basically a formula for finding area under a curve. Area is height times width. For the finest approximate, split the curve into infinitesimally wide rectangles under the curve. The height of these rectangles would the value of y at every given point, so f(x). your width is going to be an infinitessimally small change in x, or dx. so your area is going to be the sum of all the rectangles with height of f(x) multiplied by dx. you can write this like sigma notation where A=S f(x)*dx and thats how why dx is used
@wallybaldemor85234 жыл бұрын
@3:38 its like a conjugate, my opinion only
@ultravidz7 жыл бұрын
That was insane I was not able to solve it
@michaelboy66055 жыл бұрын
You can turn sin2x into 2sincos, pull out the 1/2 from the integrand, then make a u substitution for u=sqrt(tanx). Then set up a right triangle with angle of x and opposite of u^2 and adjacent of 1. Since du=sec^2/2u dx, you can make sec^2 = u^2 + 1. Then sub in “[2u/(u^2+1)]*du = dx” into integrand, and you get awesome cancelation that ends up being integral of 1 du which is u which is sqrt(tanx)+c, your way is really cool I like it
@tarekhisham45734 жыл бұрын
Assume tan equals u from the beginning and the process will become much simpler and easier
@selcukpolat23717 жыл бұрын
I am enlightened.... Thank you so much!
@khalidmustafa71023 жыл бұрын
multiply cosx and devide cosx then it will become simple
@carllacoste58244 жыл бұрын
How sin(2x) turns into 2sin(X)cos(X)?
@HeyKevinYT4 жыл бұрын
search it up its a basic identity that can be easily derived from sin(a+b) formula
@germanorozco40726 жыл бұрын
Muchas gracias me ha sido de gran ayuda
@luismariabiaggioni85143 жыл бұрын
Menos mal que te entiendo por lo que escribes, porque si fuera por lo que dices en tu inglés achinado, estaría frito. A veces me parece que haces un misterio de problemas que pueden resolverse en forma más sencilla. Igual, gracias por tu esfuerzo y amor por las matemáticas.
@Suyog_07_126 жыл бұрын
What a lovely solution!!
@adnanace58674 жыл бұрын
why not just simply, put tanx=t^2 and multiply by sec^2(x)/sec^2(x), we would get answer in literally 2 steps .
@abeltesfahun61923 жыл бұрын
good job, man
@elbisho20458 жыл бұрын
awesome!!! keep making videos
@avisinghvi61708 жыл бұрын
Man you are great!
@jhosefroberth68164 жыл бұрын
Muchas gracias realmente me ayudó un montón
@muhammedg-tips15843 жыл бұрын
i solved this in 3 minutes ♥
@dineshpethad58564 жыл бұрын
dx/dy+2ytanx=sinx How to do this D.E
@yassinezaoui45555 жыл бұрын
I think writing sin(2x) as 2t/(1+t²) would be better and make it more easier 🤔
@rishabhmahajan66077 жыл бұрын
Just make tan(x) = t2, and multiply numerator and denominator by sec(x), and it is solved in one line
@Jeff-wc5ho6 жыл бұрын
What's so special about that tan sub? It seems to be a very powerful tool to solve otherwise nasty integrals.
@Aek1961 Жыл бұрын
Διαιρώ αριθμιτη και παονομαστή με cos^2 x. Έχω ολα tanx και στο αριθμιτή έχω sec^2 x!!!! Και τελειώνει το παραμύθι .......
@koustavhalder88394 жыл бұрын
hey you could have directly substituted sin2x=2tanx/1+tan²x...i guess it would have been easier..
@nishchhal-zb4xc Жыл бұрын
It took me 30 seconds man!
@viletomedoze50365 жыл бұрын
Can someone please turn 5.sin x(.cosx)^3 to (√tanx)
@plislegalineu30052 жыл бұрын
now suppose you don't know this integral solve a diff-eq dy/dx = y/sin(2x)
@dingwahliaw53619 күн бұрын
👍👍👍👍👍
@FunctionalIntegral5 жыл бұрын
You are making it too complicated. Just substitute u=sqrt(tan(x)) and the rest is trivial.
@ahmedarfat4 жыл бұрын
Nice
@divyajyotibose57695 жыл бұрын
Can you make a video on integration of {(4e^x+6e^-x)/(9e^x-4e^-x)}dx
@TheRealSamSpedding8 жыл бұрын
That was nifty
@ericknutson32967 жыл бұрын
Integrate(sin^x(x))dx=????
@muffymypup18717 жыл бұрын
good job. amazing. thnkyou
@GUYANESEGT5 жыл бұрын
what kind of witchcraft is this
@HeyKevinYT4 жыл бұрын
mathematicus
@dudewaldo42 жыл бұрын
Use IBP with dv = sqrt tanx because you have already done the video on that :P
@angadsharma47152 ай бұрын
The answer is wrong dear it will be -2/√tan x +C
@itsallfun496411 күн бұрын
Bro explained he is smart and dumb at the same time....u can express double of sin in terms of tangent....and then use substitution method....bro just takes 6 steps....
@chessandmathguy8 жыл бұрын
Very nice!
@jntnayem13944 жыл бұрын
I'm sorry, but I don't know your name, sir.. May I allow, please???
@benedictaamoako-gyamfi67334 жыл бұрын
cool...you are brilliant and handsome
@Jeff-wc5ho6 жыл бұрын
beautiful problem :)
@williamtachyon26306 жыл бұрын
Cool!
@atmsc4nd4l4 жыл бұрын
Wow. Same method. Coincidence? 😅
@azoznail12235 жыл бұрын
I solved it with an easier way
@wilsonoliveira7447 Жыл бұрын
Cool...
@Gamma_Digamma5 жыл бұрын
You could have just written sin2x in terms of tan as 2tanx/(1+tan^2x), could have probably taken less steps...
@manishkumar-qz9gx7 жыл бұрын
Ans the( √sin2x.dx) Tell me ans
@justforfun22384 жыл бұрын
Trivial
@ujueije57627 жыл бұрын
Stop using Mathematica Alpha & Wolfram Alpha online software.
@jeshurunluke55736 жыл бұрын
These are really simple integrals... he's a calc teacher he shouldnt have a problem with something like this
@eswerreddyduggireddy52754 жыл бұрын
Hi
@SatyanarayanaMudunuri Жыл бұрын
Unimpressive. It is simple to write sin 2x = 2tanx/sec^2 x, and let t = tanx
@marcushendriksen84155 жыл бұрын
That was a long way of saying that the denominator basically worked out to be 1, just saying ;)
@agwuokoman79763 жыл бұрын
Thanks alot
@dhanushsk15493 жыл бұрын
The most easiest way write sin2x as 2tanx÷1+tan^2x
@manishrai68573 жыл бұрын
Substitute sin2x by 2tanx /1+tan^2x and substitute tanx as t 😎🤓💯🧠🤙