Try
at(diff(cos(x),x),x=0);
> -----Original Message-----
> From: maxima-bounces at math.utexas.edu
> [mailto:maxima-bounces at math.utexas.edu] On Behalf Of
> twang.umn at gmail.com
> Sent: Saturday, October 20, 2007 4:24 PM
> To: maxima at math.utexas.edu
> Subject: derivative at a certain point
>
> Hi all,
>
> I am running maxima for a couple of weeks. I want to ask,
> maybe it is a stupid question: how can I get the derivative
> of a certain function at a given point.
>
> Like if I want to know the derivative of cos(x) when x=0?
>
> Best,
>
> Teng
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