$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}\left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} } \right)$ નું મૂલ્ય શોધો.

  • A
    $\frac{21}{19}$
  • B
    $\frac{19}{21}$
  • C
    $\frac{22}{23}$
  • D
    $\frac{23}{22}$

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જો $x$ ઋણ શક્ય કિંમત ધારણ કરે,તો $\sin^{-1} x$ બરાબર શું થાય?

$\tan \left(2 \tan ^{-1} \frac{1}{5} + \sec ^{-1} \frac{\sqrt{5}}{2} + 2 \tan ^{-1} \frac{1}{8}\right)$ ની કિંમત શોધો.

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

$\sin ^{-1}(\cos(\sin ^{-1} x)) + \cos ^{-1}(\sin(\cos^{-1} x)) = \text{ . . . . . . }$

$\sin \left( {2{{\tan }^{ - 1}}\left( {\frac{1}{3}} \right)} \right) + \cos ({\tan ^{ - 1}}(2\sqrt 2 ))$ ની કિંમત શોધો.

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