Hi!
I've got a little problem solving this:
f(x)=tan^3(4x+x^2)
(its a cubed tangent..)
Can't find f' ...
well I do get f'(x)=3.tan^2(4x+x^2)*(2x+4)*(1+tan(4x+x^2))
But it dosent sound right to me so have you got any idea whats wrong and how to solve this?
Thank you
charlie