# Thread: how to make a derivative by x..

1. ## how to make a derivative by x..

$
y'=Ae^y+Be^{-y}+2
$

y is a function of x
$
y'=Ae^y+Be^{-y}+2
$

so
$
y''=Ae^yy'+Be^{-y}y'+2
$

2. Originally Posted by transgalactic
$
y'=Ae^y+Be^{-y}+2
$

y is a function of x
$
y'=Ae^y+Be^{-y}+2
$

so
$
y''=Ae^yy'+Be^{-y}y'+2
$
I don't know about anwone else but I can't see a question here, what is it you want to do?

CB

3. If $\frac{dy}{dx} = Ae^y + Be^{-y} + 2$

then,

$\frac{d^2y}{dx^2} = Ae^y \frac{dy}{dx} - Be^{-y} \frac{dy}{dx}$

4. Originally Posted by CaptainBlack
I don't know about anwone else but I can't see a question here, what is it you want to do?

CB
I believe they have been given the 1st derivative, and have been asked to find the second?