indefinite-integration

Question: $\int_{{}}^{{}}{\frac{dx}{\sin x+\cos x}}=$

1) $\log \tan \left( \frac{\pi }{8}+\frac{x}{2} \right)+c$

2) $\log \tan \left( \frac{\pi }{8}-\frac{x}{2} \right)+c$

3) $\frac{1}{\sqrt{2}}\log \tan \left( \frac{\pi }{8}+\frac{x}{2} \right)+c$

4) None of these

Solution:

Explanation: No Explanation

Fundamental integration

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