TuringTest
  • TuringTest
Fun integral that seems to have gotten deleted, so I'm posting it again.\[\int_0^\pi\frac{x\sin x}{1+\cos^2x}dx\](yes I am an idiot, I accidentally closed the other post)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Kainui
  • Kainui
Haha do I do trig substitution on this? I can't resist must go for it.
Hero
  • Hero
My calc could do this in two seconds
TuringTest
  • TuringTest
actually the answer on the test is given, ad I think wolf can do it to the problem on the test is to prove the result is what it is (it's from the entrance exam to a university here in Mexico)

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TuringTest
  • TuringTest
and*
TuringTest
  • TuringTest
y'all wanna know the answer? the proof still remains...
Hero
  • Hero
Torturing students at U of M I see
TuringTest
  • TuringTest
Cinvestav, for masters and doctorates only
anonymous
  • anonymous
\[I=\int_0^\pi\frac{x\sin x}{1+\cos^2x}\text{d}x\] \[x=\pi-t\]\[I=\int_\pi^0\frac{(\pi-t)\sin t}{1+\cos^2t}(-\text{d}t)=\int_0^\pi\frac{(\pi-t)\sin t}{1+\cos^2t}\text{d}t\]\[=\int_0^\pi\frac{\pi\sin t}{1+\cos^2t}\text{d}t-\int_0^\pi\frac{t\sin t}{1+\cos^2t}\text{d}t\]\[2I=\int_0^\pi\frac{\pi\sin t}{1+\cos^2t}\text{d}t=-\pi \ \tan^{-1} (\cos t) |_0^\pi=\frac{\pi^2}{4}\]\[I=\frac{\pi^2}{8}\]
anonymous
  • anonymous
emm...\[2I=\int_0^\pi\frac{\pi\sin t}{1+\cos^2t}\text{d}t=-\pi \ \tan^{-1} (\cos t) |_0^\pi=\frac{\pi^2}{2}\]\[I=\frac{\pi^2}{4}\]
TuringTest
  • TuringTest
@mukushla nailed it, as usual! Very similar to my approach, hats off :D
ParthKohli
  • ParthKohli
How do you people do that? :|
ParthKohli
  • ParthKohli
Stop being geniuses, or I'd kill myself one day for my ignorance. :P
TuringTest
  • TuringTest
It's called practice, as I always say...
Kainui
  • Kainui
This just seems like guessing what the solutions to a quadratic equation are or what the integrating factor of an exact differential equation is without actually working it out. How do you practice this? I don't remember this in Cal 1 or 2, but I'm damn interested. Maybe I'm not conceptualizing integrals in their simplest possible form... if that makes sense.
TuringTest
  • TuringTest
The best reply to that is 3 hints... hint one: integration by parts let me know how that goes and I will give more hints if necessary

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