1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Integral of cos(8x^2)? multivariable calc

  1. Feb 23, 2012 #1
    Integral of cos(8x^2)??? multivariable calc

    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution

    So i reversed the order...


    and couldn't figure out how to integrate cos(8x^2). I looked at my trig identities, tried on my graphing calc, and even wolfram alpha gave me a strange answer that i cant use.

    Either i'm doing something wrong, or missing something obvious.

  2. jcsd
  3. Feb 23, 2012 #2
    Re: Integral of cos(8x^2)??? multivariable calc

    ...dy dx?
  4. Feb 23, 2012 #3
    Re: Integral of cos(8x^2)??? multivariable calc

    oh yeah. in my work i should have wrote dydx instead of dxdy good catch. wow. maybe i can solve it now.

    lets see...

    wow... the answer was 0, after a page of work and a few hours of confusion
    Last edited: Feb 23, 2012
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook