ધારો કે $f(x) = \cos^{-1}\left(\frac{2x}{1+x^2}\right) + \sin^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,તો $f(1) + f(2)$ ની કિંમત શોધો.

  • A
    $-\pi$
  • B
    $0$
  • C
    $\pi$
  • D
    $2\pi$

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${\tan ^{ - 1}}\left[ {\cos \left( {2\,{{\tan }^{ - 1}}\frac{3}{4}} \right)\, + \,\sin \,\left( {2\,{{\cot }^{ - 1}}\frac{1}{2}} \right)} \right]$ ની કિંમત શું છે?

જો $3 \sin ^{-1}\left(\frac{2 x}{1+x^2}\right)-4 \cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)+2 \tan ^{-1}\left(\frac{2 x}{1-x^2}\right)=\frac{\pi}{3}$ હોય,તો $x$ ની કિંમત શોધો.

$\cos ^{-1}\left(2 x^{2}-1\right)$ નું $\cos ^{-1} x$ ની સાપેક્ષમાં વિકલન શું થાય?

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

$4 \tan^{-1} \frac{1}{5} - \tan^{-1} \frac{1}{70} + \tan^{-1} \frac{1}{99} = $

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