# Mathcad Second Derivative Test Issue

• March 21st 2011, 07:20 AM
Turlock
I'm trying to do a simple second derivative test on mathcad but the answer I always get is 0. I'm totally baffled now.
• March 21st 2011, 08:53 AM
Plato
Quote:

Originally Posted by Turlock
I'm trying to do a simple second derivative test on mathcad but the answer I always get is 0. I'm totally baffled now.

$\frac{d^2}{dx^2} V(Stationary point value)$
and it gives 0 everytime. I managed to work it out by doing $\frac{d^2}{dx^2} V(x)$ and typing x:=(Stationary point value) above it.