જો $2 \tan^{-1} x = 3 \sin^{-1} x$ અને $x \neq 0$ હોય, તો $8x^2 + 1 =$

  • A
    $13$
  • B
    $5$
  • C
    $\sqrt{7}$
  • D
    $\sqrt{17}$

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જો $\sin ^{-1} x + \sin ^{-1}(1-x) = \cos ^{-1} x$ હોય, તો $x \in$

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