indefinite-integration

Question: If $\int_{{}}^{{}}{(\cos x-\sin x)\ dx=\sqrt{2}\sin (x+\alpha )+c}$, then $\alpha =$



1) $\frac{\pi }{3}$
2) $-\frac{\pi }{3}$
3) $\frac{\pi }{4}$
4) $-\frac{\pi }{4}$
Solution: Explanation: No Explanation
Fundamental integration

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