Can Weierstrass Substitution Solve This Definite Integral?

zhiyuanhou
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Hi everyone, when I was dealing with a physics problem, I find a definite integral and I cannot solve it.
\int_{0}^{2\pi}\frac{1}{(a+cosx)^{2}}dx
a is constant.
Thank you!
 
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ha ha! Weierstrass substitution is well! Thank you!
 

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