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

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$\cot^{-1} \frac{3}{4} + \sin^{-1} \frac{5}{13} = $

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