\(\int \frac{\cos 2x – \cos 2\theta}{\cos x – \cos \theta}\,dx \text{ is equal to:}\)
\( \text{(A) } 2(\sin x + x\cos\theta) + C \)
\( \text{(B) } 2(\sin x – x\cos\theta) + C \)
\( \text{(C) } 2(\sin x + 2x\cos\theta) + C \)
\(.\text{(D) } 2(\sin x – 2x\cos\theta) + C \)
\( \text{(A) } 2(\sin x + x\cos\theta) + C \)
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