If $\sin^2 x + 2\cos y + xy = 0$,then $\frac{dy}{dx} = $

  • A
    $\frac{y + 2\sin x}{2\sin y + x}$
  • B
    $\frac{y + \sin 2x}{2\sin y - x}$
  • C
    $\frac{y + 2\sin x}{\sin y + x}$
  • D
    None of these

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