indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\cos 2x-\cos 2\alpha }{\cos x-\cos \alpha }}dx=$

1) $2[\sin x+x\cos \alpha ]+c$

2) $2[\sin x+\sin \alpha ]+c$

3) $2[-\sin x+x\cos \alpha ]+c$

4) $-2[\sin x+\sin \alpha ]+c$

Solution:

Explanation: No Explanation

Fundamental integration

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