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Question Number 147835 by peter frank last updated on 23/Jul/21

$$provethat$$$$\int \cos 2\theta log\left(\frac{\cos \theta +\sin \theta }{\cos \theta -\sin \theta }\right)=\frac{1}{2}\sin 2\theta log[\tan (\frac{\pi }{4}+\theta )+\frac{1}{2}\log \left(\cos 2\theta \right)$$$$$$

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