यदि $x^2 \tan ^{-1} \frac{y}{x}-y^2 \tan ^{-1} \frac{x}{y}=k$ है,तो $\left(\frac{d y}{d x}\right)_{(1,1)}=$

  • A
    $0$
  • B
    $\pi / 4$
  • C
    $1$
  • D
    $\pi / 2$

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