diff(integrate(cos(k*x)*cos(n*x),x));

• Subject: diff(integrate(cos(k*x)*cos(n*x),x));
• From: Stavros Macrakis
• Date: Mon, 13 Jan 2003 23:23:27 -0500

Here's one way to simplify:

(C1) diff(integrate(cos(k*x)*cos(n*x),x),x);

        COS((n + k) x)   COS((k - n) x)
(D1)    -------------- + --------------
              2                2

(C2) ratsimp(trigexpand(expand(%)));

(D2)           COS(k x) COS(n x)

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