definite-integral

Question: $\int\limits_{\pi /4}^{3\pi /4}{\frac{dx}{1+\cos x}}$ is equal to



1) 2
2) $-2$
3) $\frac{1}{2}$
4) $-\frac{1}{2}$
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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