यदि $\cos x - \sin x = \sqrt{a} \sin x$ है,तो $a \sin x + \cos x - \sin x = $

  • A
    $-\sqrt{a} \sin x$
  • B
    $\sqrt{a} \cos x$
  • C
    $(\sqrt{a} - 1) \sin x$
  • D
    $-\sqrt{a} \cos x$

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