જો $y = \operatorname{Sin}^{-1}\left(\frac{2x}{1+x^2}\right)$ અને $\left(\frac{d^2y}{dx^2}\right)_{x=2} = k$ હોય,તો $25k =$

  • A
    $(-3)^2$
  • B
    $(-2)^3$
  • C
    $3$
  • D
    $(-2)^5$

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જો $\sqrt{1-x^2}+\sqrt{1-y^2}=a(x-y)$ હોય,તો $\left[\left(1-x^2\right)^2 \frac{d^2 y}{d x^2}+y\left(1-x^2\right)\right] \frac{d y}{d x}=$

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