જો $\sin \left(\frac{x+y}{x-y}\right)=\tan \frac{\pi}{5}$ હોય,તો $\frac{d y}{d x}=$

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

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