$\cos \left[ 2\cos^{-1}\frac{1}{5} + \sin^{-1}\frac{1}{5} \right] = $

  • A
    $\frac{2\sqrt{6}}{5}$
  • B
    $-\frac{2\sqrt{6}}{5}$
  • C
    $\frac{1}{5}$
  • D
    $-\frac{1}{5}$

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સમીકરણ $2\cos^{-1}x + \sin^{-1}x = \frac{11\pi}{6}$ ને

જો $\theta = \cot^{-1}(7) + \cot^{-1}(8) + \cot^{-1}(18)$ હોય,તો $\cot \theta$ ની કિંમત શોધો.

જો $\tan ^{-1}\left[\frac{\sqrt{1+x^2}-\sqrt{1-x^2}}{\sqrt{1+x^2}+\sqrt{1-x^2}}\right]=\alpha$ હોય,તો $\sin 2 \alpha$ ની કિંમત શોધો.

$(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8} \Rightarrow x=$

જો $\cos ^{-1}\left(\frac{5}{13}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=\cos ^{-1} x$ હોય, તો $x$ ની કિંમત શોધો.

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