1. The problem statement, all variables and given/known data Find the derivative of: f(x)= ((x+xsinx)/(1+2tan2x))3 3. The attempt at a solution I solved it and got : f'(x)= (3(1+2tan2x)3(x+xsinx)2(sinx+xcosx+1)-12(x+xsinx)3(2tan2x+1)2(tanxsec2x))/(1+2tan2x)6 Can anyone confirm if this is alright? Also, anyone knows a webpage that has an online calculator that would confirm this kind of math problems? Thanks.