definite-integral

Question: The value of $\int_{\pi /4}^{3\pi /4}{\frac{\varphi }{1+\sin \varphi }\,d\varphi ,}$ is



1) $\pi \tan \frac{\pi }{8}$
2) $\log \tan \frac{\pi }{8}$
3) $\tan \frac{\pi }{8}$
4) None of these
Solution: Explanation: No Explanation
Properties of definite integration

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