1. Mar 30, 2007 #1

   rishiraj20006

   

   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)]

    

   rishiraj20006, Mar 30, 2007
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3. Mar 31, 2007 #2

   VietDao29

   

   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?

    

   VietDao29, Mar 31, 2007
4. Mar 31, 2007 #3

   Gib Z

   

   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?

    

   Gib Z, Mar 31, 2007

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