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

From angles pi minus theta1 to pi plus theta1, what is the integral of cosine of 2 theta times d theta?

2. Relevant equations

3. The attempt at a solution

When I evaluate this definite integral from pi minus theta1 to pi plus theta1, I get positive one half sine of 2 theta1.

It should be NEGATIVE one half sine of 2 theta1.

Is 2pi + 2theta1 and 2pi - 2theta1 somehow wrong????

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# Cosine of 2 times theta

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