यदि $y = \operatorname{Sin}^{-1}\left(\frac{2x}{1+x^2}\right)$ और $\left(\frac{d^2y}{dx^2}\right)_{x=2} = k$ है,तो $25k =$

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

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यदि $y=\tan ^{-1}\left[\frac{\log _e\left(\frac{e}{x^2}\right)}{\log _e\left(e x^2\right)}\right]+\tan ^{-1}\left[\frac{3+2 \log _e x}{1-6 \log _e x}\right]$ है, तो $\frac{d^2 y}{d x^2}=$

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