यदि $A=2 \tan ^{-1}\left(\frac{1+x}{1-x}\right)$ और $B=\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,जहाँ $x \in(0,1)$,तो $A-B=$

  • A
    $\frac{\pi}{4}$
  • B
    $4 \tan ^{-1} x$
  • C
    $\tan ^{-1} x$
  • D
    $\frac{\pi}{2}$

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