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 problem

  1. Mar 30, 2007 #1
    1. The problem statement, all variables and given/known data

    help me integrate

    2. Relevant equations

    e^{xsinx+cosx}[x^4(cosx)^3-xsinx+cosx/x^2.(cosx)^2]dx

    3. The attempt at a solution

    it s to lengthy and i have still not find the form that is e^x[f(x)+f`(x)]
     
  2. jcsd
  3. Mar 31, 2007 #2

    VietDao29

    User Avatar
    Homework Helper

    The problem you posted is not very clear to me. Are you trying to integrate:
    [tex]\int e ^ {x \sin x + \cos x} \left( \frac{x ^ 4 \cos ^ 3 x - x \sin x + \cos x}{x ^ 2 \cos ^ 2 x} \right) dx[/tex]?
    You seems to be missing a dew parentheses.
    Is that the problem?
     
  4. Mar 31, 2007 #3

    Gib Z

    User Avatar
    Homework Helper

    Perhaps the fact that you want it in the form of [itex]e^x [f(x)+f'(x)][/itex] hints you want to make a substitution u= x sin x + cos x?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook