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

What is

[tex]

\int_0^{2 \pi} \; d\theta \sin^2 k\theta \cos^2 k\theta \; ?

[/tex]

2. Relevant equations

Orthogonality of sines and cosines?

3. The attempt at a solution

I tried substitution and didn't get anywhere. Yeah, that's about it.

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