Hi , I am having trouble integrating this problem. Integrate x^2 sin(x^2) dx Here is what i did. I used the substitution method. u = x^2 sqrt u = x du = 2x dx du/2x = dx du/2 sqrt u = dx since sqrt u = x substituting this in the equation u sin(u) du/2 sqrt u Now i don't know how to integrate this. Please help, thanks.