indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\cos 2x}{{{(\cos x+\sin x)}^{2}}}\ dx=}$



1) $\log \sqrt{\cos x+\sin x}+c$
2) $\log (\cos x-\sin x)+c$
3) $\log (\cos x+\sin x)+c$
4) $-\frac{1}{\cos x+\sin x}+c$
Solution: Explanation: No Explanation
Integration by substitution

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