यदि $x+y=\tan ^{-1} y$ और $\frac{d^{2} y}{d x^{2}}=f(y) \frac{d y}{d x}$ है,तो $f(y)$ का मान ज्ञात कीजिए।

  • A
    $\frac{-2}{y^{3}}$
  • B
    $\frac{2}{y^{3}}$
  • C
    $\frac{1}{y}$
  • D
    $\frac{-1}{y}$

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