જો $x=\log _e\left(\frac{\cos \frac{y}{2}-\sin \frac{y}{2}}{\cos \frac{y}{2}+\sin \frac{y}{2}}\right)$ અને $\tan \frac{y}{2}=\sqrt{\frac{1-t}{1+t}}$ હોય,તો $\left(\frac{dy}{dx}\right)_{t=\frac{1}{2}}$ નું મૂલ્ય શોધો.

  • A
    $\frac{1}{2}$
  • B
    $-\frac{1}{2}$
  • C
    $\frac{1}{4}$
  • D
    $-\frac{1}{4}$

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