- #1

Sakha

- 297

- 0

## Homework Statement

Find the derivative of:

f(x)= ((x+xsinx)/(1+2tan

^{2}x))

^{3}

## The Attempt at a Solution

I solved it and got :

f'(x)= (3(1+2tan

^{2}x)

^{3}(x+xsinx)

^{2}(sinx+xcosx+1)-12(x+xsinx)

^{3}(2tan

^{2}x+1)

^{2}(tanxsec

^{2}x))/(1+2tan

^{2}x)

^{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.