જો $\sin y = x \cos (a + y)$ હોય,તો $\frac{dy}{dx} = $

  • A
    $\frac{\cos^2 (a + y)}{\cos a}$
  • B
    $\frac{\cos (a + y)}{\cos^2 a}$
  • C
    $\frac{\sin^2 (a + y)}{\sin a}$
  • D
    આમાંથી કોઈ નહીં

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