જો $\log _{10}\left(\frac{x^2-y^2}{x^2+y^2}\right)=2$ હોય,તો $\frac{dy}{dx} = \dots$

  • A
    $-\frac{99x}{101y}$
  • B
    $\frac{99x}{101y}$
  • C
    $-\frac{99y}{101x}$
  • D
    $\frac{99y}{101x}$

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