ધારો કે $a_1=1, a_2, a_3, a_4, \ldots$ ક્રમિક પ્રાકૃતિક સંખ્યાઓ છે. તો $\tan ^{-1}\left(\frac{1}{1+ a _1 a _2}\right)+\tan ^{-1}\left(\frac{1}{1+ a _2 a _3}\right)+\ldots+\tan ^{-1}\left(\frac{1}{1+ a _{2021} a _{2022}}\right)$ ની કિંમત શોધો.

  • A
    $\frac{\pi}{4}+\cot ^{-1}(2022)$
  • B
    $\cot ^{-1}(2022)-\frac{\pi}{4}$
  • C
    $\tan ^{-1}(2022)-\frac{\pi}{4}$
  • D
    $\frac{\pi}{4}-\tan ^{-1}(2022)$

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જો $\cos^{-1} x = \alpha$ $(0 < x < 1)$ અને $\sin^{-1} (2 x \sqrt{1 - x^2}) + \sec^{-1} (\frac{1}{2 x^2 - 1}) = \frac{2 \pi}{3}$ હોય,તો $\alpha$ ની કિંમત શોધો.

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

$\cos \left(\sin ^{-1} \frac{3}{5}+\sin ^{-1} \frac{5}{13}+\sin ^{-1} \frac{33}{65}\right) = . . . . .$

જો ${\sin ^{ - 1}}\left( {\frac{{2a}}{{1 + {a^2}}}} \right) + {\sin ^{ - 1}}\left( {\frac{{2b}}{{1 + {b^2}}}} \right) = 2{\tan ^{ - 1}}x,$ હોય,તો $x = $

$\tan \left[ {\frac{1}{2}{{\sin }^{ - 1}}\left( {\frac{{2a}}{{1 + {a^2}}}} \right) + \frac{1}{2}{{\cos }^{ - 1}}\left( {\frac{{1 - {a^2}}}{{1 + {a^2}}}} \right)} \right] = $

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