1. ## First-derivative

Stydy sign of derivative function :

2. Hello.

Originally Posted by dhiab
Stydy sign of derivative function :
What exactly are you asking for? Just asking for the first derivative?

Well [x]'=1

$[ln(|x|)]' = \frac 1 x$

$[e^{-x}]' = - e^{-x}$

Thus

$f'(x) = 1 + \frac 1 x - e^{-x}$

Yours,
Rapha

3. hello : Stydy sign now