જો $\cos ^{-1}\left(\frac{x^2-y^2}{x^2+y^2}\right)=k$ (અચળ) હોય, તો $\frac{d y}{d x}$ ની કિંમત શોધો.

  • A
    $\frac{y}{x}$
  • B
    $\frac{x}{y}$
  • C
    $\frac{x^2}{y^2}$
  • D
    $\frac{y^2}{x^2}$

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