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

what is cos(2n*pi)

2. Relevant equations

3. The attempt at a solution

I understand that cos(npi)=(-1)^n

so is cos(2n*pi)=2(-1)^n ??

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# Cosine function

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