If $\sin ^2 x + \cos ^2 y = 1$,then $\frac{dy}{dx} = $

  • A
    $\frac{\sin ^2 x}{\sin ^2 y}$
  • B
    $\frac{\sin ^2 y}{\sin ^2 x}$
  • C
    $\frac{\sin 2x}{\sin 2y}$
  • D
    $\frac{-\sin ^2 y}{\sin ^2 x}$

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