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

  • A
    $-2$
  • B
    $-1$
  • C
    $1$
  • D
    $2$

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यदि $\cot^{-1} \alpha + \cot^{-1} \beta = \cot^{-1} x$ है,तो $x = $

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