यदि $0 < x < 1$ और $\tan ^{-1}(1-x), \tan ^{-1} x$ तथा $\tan ^{-1}(1+x)$ समांतर श्रेणी ($A$.$P$.) में हैं,तो $x^3$ का मान : . . . . . . है।

  • A
    $x^2-1$
  • B
    $1+x^2$
  • C
    $1-x^2$
  • D
    $x^2$

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