જો ${\tan ^{ - 1}}(x - 1) + {\tan ^{ - 1}}x + {\tan ^{ - 1}}(x + 1) = {\tan ^{ - 1}}3x$ હોય,તો $x =$

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

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વિધાન $I:$ સમીકરણ $(\sin^{-1} x)^3 + (\cos^{-1} x)^3 - a\pi^3 = 0$ નો ઉકેલ તમામ $a \ge \frac{1}{32}$ માટે મળે છે.
વિધાન $II:$ કોઈપણ $x \in [-1, 1]$ માટે,$\sin^{-1} x + \cos^{-1} x = \frac{\pi}{2}$ અને $0 \le (\sin^{-1} x - \frac{\pi}{4})^2 \le \frac{9\pi^2}{16}$ છે.

ધારો કે $S_{k} = \sum_{r=1}^{k} \tan^{-1}\left(\frac{6^{r}}{2^{2r+1} + 3^{2r+1}}\right)$. તો $\lim_{k \rightarrow \infty} S_{k}$ ની કિંમત શોધો.

$\sec ^2(\tan ^{-1} 2)+\operatorname{cosec}^2(\cot ^{-1} 3) = $ . . . . . . .

કિંમત શોધો: $\tan^{-1} \left( \frac{a - b}{1 + ab} \right) + \tan^{-1} \left( \frac{b - c}{1 + bc} \right)$

જો $x, y, z$ એ $A.P.$ માં હોય અને $\tan ^{-1} x, \tan ^{-1} y, \tan ^{-1} z$ પણ $A.P.$ માં હોય,તો

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