જો $x+y=\tan ^{-1} y$ અને $\frac{d^{2} y}{d x^{2}}=f(y) \frac{d y}{d x}$ હોય,તો $f(y)$ ની કિંમત શોધો.

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

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

જો $x^{3}+y^{3}-3 a x y=0$ હોય,તો $\frac{d y}{d x}$ ની કિંમત શું થાય?

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