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.

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- Mar 21st 2011, 07:20 AMTurlockMathcad Second Derivative Test Issue
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.

- Mar 21st 2011, 08:53 AMPlato
- Mar 21st 2011, 11:06 AMTurlock
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. - Mar 21st 2011, 11:35 AMPlato
Here is how I do it. It takes a second function on my version.