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

  • A
    $0$
  • B
    $\frac{1}{{\sqrt 5 }}$
  • C
    $\frac{2}{{\sqrt 5 }}$
  • D
    $\frac{{\sqrt 3 }}{2}$

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જો $\sum_{n=1}^{2026} \tan^{-1}(\frac{1}{n^2+n+1}) = \tan^{-1}(1 - \frac{1}{x})$, જ્યાં $x \neq 0$, તો $x = $

$2 \tan ^{-1}\left(\frac{1}{3}\right)-\tan ^{-1}\left(\frac{3}{4}\right)=$

$\tan \left(\frac{\pi}{4}+\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)+\tan \left(\frac{\pi}{4}-\frac{1}{2} \cos ^{-1}\left(\frac{a}{b}\right)\right)$ ની કિંમત શોધો.

જો $\sin ^{-1} x+\cos ^{-1} y=\frac{3 \pi}{10}$ હોય,તો $\cos ^{-1} x+\sin ^{-1} y$ ની કિંમત શોધો.

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 = $

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