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how to identify certain variables as constants?

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For example, I have this equation
A*cos( w0*t+phi) * B*sin(n*w0*t+phi+psi)
where A,B,w0,psi are all constants, and n is a positive non zero integer.
I want to integrate with repsect to psi, from 0 to 2*pi, and I already know the answer is zero.
How do I make the symbolic toolbox understand the problem in a way it can come to that result?

Accepted Answer

John D'Errico
John D'Errico on 9 Nov 2020
Why not try it?
syms A B w0 t phi psi
syms n positive integer
V = A*cos(w0*t + phi)*B*sin(n*w0*t + phi + psi);
ans = 

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