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

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

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$\tan^{-1}\left(\frac{x}{y}\right) - \tan^{-1}\left(\frac{x-y}{x+y}\right)$ का सरलीकृत रूप किसके बराबर है?

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