$\int \frac{\cos 2x - \cos 2\theta}{\cos x - \cos \theta} \, dx$ is equal to

Question

$2 (\sin x + x \cos \theta) + c$

$2 (\sin x - x \cos \theta) + c$

$2 (\sin x + 2x \cos \theta) + c$

$2 (\sin x - 2x \cos \theta) + c$

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