$\tan^{-1}4x + \tan^{-1}6x = \frac{\pi}{6}$ ના ઉકેલોની સંખ્યા શોધો, જ્યાં $-\frac{1}{2\sqrt{6}} < x < \frac{1}{2\sqrt{6}}$ છે.

  • A
    $3$
  • B
    $0$
  • C
    $1$
  • D
    $2$

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જો $\tan ^{-1}\left(\frac{x}{2}\right)+\tan ^{-1}\left(\frac{y}{2}\right)+\tan ^{-1}\left(\frac{z}{2}\right)=\frac{\pi}{2}$ હોય,તો $x y+y z+z x=$

જો $\sum_{n=1}^{2026} \tan^{-1}(\frac{1}{n^2+n+1}) = \tan^{-1}(1 - \frac{1}{x})$, જ્યાં $x \neq 0$, તો $x = $

જો ${\tan ^{ - 1}}\frac{{1 - x}}{{1 + x}} = \frac{1}{2}{\tan ^{ - 1}}x$ હોય,તો $x = $

$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

જો $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=\pi$ અને $x^2+y^2+z^2+k x y z=1$ હોય,તો $k$ ની કિંમત શોધો.

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