જો ${\tan ^{ - 1}}x + 2{\cot ^{ - 1}}x = \frac{{2\pi }}{3}$ હોય,તો $x =$ શોધો.

  • A
    $\sqrt 2 $
  • B
    $3$
  • C
    $\sqrt 3 $
  • D
    $\frac{{\sqrt 3 - 1}}{{\sqrt 3 + 1}}$

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જો $x \ge 0$ માટે $\theta = \sin^{-1}x + \cos^{-1}x - \tan^{-1}x$ હોય,તો $\theta$ જે નાનામાં નાના અંતરાલમાં આવે છે તે છે

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$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

$\tan \left[2 \tan ^{-1} \frac{1}{5}-\frac{\pi}{4}\right]$ ની કિંમત શોધો.

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