यदि $(\tan^{-1} x)^2 + (\cot^{-1} x)^2 = \frac{5\pi^2}{8}$ है,तो $x$ =

  • A
    $-1$
  • B
    $0$
  • C
    $1$
  • D
    $\frac{1}{2}$

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यदि $(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8}$ है,तो $x^2+1=$

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