mathsurgently needed
posted by Anonymous on .
Integrate ( x^2cosx)/(1+sinx)^2 dx
with limits from 0 to pi/4

Wolfram gives us this
http://integrals.wolfram.com/index.jsp?expr=%28+x%5E2cosx%29%2F%281%2Bsinx%29%5E2&random=false
I have no clue how they got that. 
but i want step by step