$\int {\frac{{\cos 2x - \cos 2\alpha }}{{\cos x - \cos \alpha }}} \,dx = $

  • A
    $2(\sin x + x\cos \alpha ) + c$
  • B
    $2(\sin x + \sin \alpha ) + c$
  • C
    $2(-\sin x + x\cos \alpha ) + c$
  • D
    $-2(\sin x + \sin \alpha ) + c$

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