(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

While solving the integral of a wave function,I came across the term cos(n*pi) , where n is an integer. Is that term equal to +1 or -1 (I know that it could be either one depending on whether n is odd or even) but how do I proceed with the integral?

2. Relevant equations

none

3. The attempt at a solution

cos (n*pi) is 1 if n is even and -1 if n is odd...but how do proceed?

thanks a lot

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# Cosine question

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