# Math Help - Derivative

1. ## Derivative

find f'(x) if
f(x)=sinh(cosh(x))

isnt this just...

cosh(cosh(x))*-sinh(x)???

2. Hello Asuhuman18
Originally Posted by Asuhuman18
find f'(x) if
f(x)=sinh(cosh(x))

isnt this just...

cosh(cosh(x))*-sinh(x)???
No. The derivative of $\cosh(x)$ is $\sinh(x)$, not $-\sinh (x)$. So the answer is $\cosh(\cosh(x))\sinh(x)$.