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

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

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સાબિત કરો કે $\frac{9 \pi}{8} - \frac{9}{4} \sin^{-1} \frac{1}{3} = \frac{9}{4} \sin^{-1} \frac{2 \sqrt{2}}{3}$.

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

$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

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

$3 \tan^{-1} a$ બરાબર શું થાય?

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