જો $4 \sin ^{-1} x + 6 \cos ^{-1} x = 3 \pi$ હોય,તો $x = \ldots$.

  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{2}$
  • C
    $0$
  • D
    $-\frac{1}{2}$

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જો $\tan^{-1} \frac{1}{1+1(2)} + \tan^{-1} \frac{1}{1+2(3)} + \tan^{-1} \frac{1}{1+3(4)} + \dots + \tan^{-1} \frac{1}{1+n(n+1)} = \tan^{-1} \theta$ હોય,તો $\theta$ =

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