try this:
s:diff(g(x),x);
f(x):=''s;
f(d/2);
That is ''s 3 characters..
RJF
Madhusudan Singh wrote:
> Quick question.
>
> How do I calculate the derivative at a point ?
>
> f(x):=diff(g(x),x);
> f(d/2) does not work when d is constant.
>
>
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