I got this result using trigsimp.
But I don't know how to get cos(k*x)*cos(n*x).
Can anyone tell me?
(C22) TRIGSIMP(DIFF(INTEGRATE(COS(k*x)*COS(n*x),x),x));
COS((n + k) x) + COS((n - k) x)
(D22) -------------------------------
2
On Mon, Jan 13, 2003 at 07:00:44PM +0100, Khiraly Kalman wrote:
> Hi!
> diff(integrate(cos(k*x)*cos(n*x),x));
>
> Why doesn't done the same resultat?:
> Theoretically diff(integrate(f(x)))=f(x)
>
> But maxima doesn't.
>
> diff(integrate(cos(k*x)*cos(n*x),x))=cos(k*x)*cos(n*x)
>
> Thanks
>
>
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--
Wang Yin
DA Lab, Tsinghua University,
100084
Beijing China