यदि $\sec ^{-1}\left(\frac{1+x}{1-y}\right)=a$ है,तो $\frac{d y}{d x}$ क्या है?

  • A
    $\frac{y-1}{x+1}$
  • B
    $\frac{y+1}{x-1}$
  • C
    $\frac{x-1}{y-1}$
  • D
    $\frac{x-1}{y+1}$

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