Differentiate the function with respect to $x$: $\cos (a \cos x + b \sin x)$,where $a$ and $b$ are constants.

  • A
    $-(a \sin x + b \cos x) \sin (a \cos x + b \sin x)$
  • B
    $(a \sin x - b \cos x) \sin (a \cos x + b \sin x)$
  • C
    $(a \sin x + b \cos x) \sin (a \cos x + b \sin x)$
  • D
    $-(a \sin x - b \cos x) \sin (a \cos x + b \sin x)$

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