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.
I thought it would be a common error given the same result everytime.
I defined my function V(x):=xxxxxx
Then typed in the following
$\displaystyle \frac{d^2}{dx^2} V(Stationary point value)$
and it gives 0 everytime. I managed to work it out by doing $\displaystyle \frac{d^2}{dx^2} V(x)$ and typing x:=(Stationary point value) above it.