यदि $x \cos (k+y)=\cos y$ है, तो $y=\frac{\pi}{2}$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • A
    $\sin k$
  • B
    $\cos k$
  • C
    $1$
  • D
    $0$

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