If $y = \sin (\sqrt {\sin x + \cos x} )$,then $\frac{dy}{dx} = $

  • A
    $\frac{1}{2} \frac{\cos \sqrt {\sin x + \cos x}}{\sqrt {\sin x + \cos x}}$
  • B
    $\frac{\cos \sqrt {\sin x + \cos x}}{\sqrt {\sin x + \cos x}}$
  • C
    $\frac{1}{2} \frac{\cos \sqrt {\sin x + \cos x}}{\sqrt {\sin x + \cos x}} (\cos x - \sin x)$
  • D
    None of these

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