${\tan ^{ - 1}}\left[ {\frac{{\sqrt {1 + {x^2}} + \sqrt {1 - {x^2}} }}{{\sqrt {1 + {x^2}} - \sqrt {1 - {x^2}} }}} \right]$,જ્યાં $|x| < 1$ અને $x \ne 0$ હોય,તેની કિંમત શું થાય?

  • A
    $\frac{\pi }{4} + \frac{1}{2}{\cos ^{ - 1}}{x^2}$
  • B
    $\frac{\pi }{4} + {\cos ^{ - 1}}{x^2}$
  • C
    $\frac{\pi }{4} - \frac{1}{2}{\cos ^{ - 1}}{x^2}$
  • D
    $\frac{\pi }{4} - {\cos ^{ - 1}}{x^2}$

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

કિંમત શોધો: $\tan ^2(\sec ^{-1} 3) + \operatorname{cosec}^2(\cot ^{-1} 2) + \cos ^2(\cos ^{-1} \frac{2}{3} + \sin ^{-1} \frac{2}{3}) = $ . . . . . . .

શ્રેણી $\tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{2}{9}\right) + \dots + \tan^{-1}\left(\frac{2^{n-1}}{1+2^{2n-1}}\right) + \dots$ ના અનંત પદોનો સરવાળો શોધો.

$0 \le x \le 1$ માટે ${\tan ^{ - 1}}\left( {\frac{{1 - x}}{{1 + x}}} \right)$ ની ન્યૂનતમ અને મહત્તમ કિંમતો શોધો.

$\tan^{-1}\left(\frac{x}{y}\right) - \tan^{-1}\left(\frac{x-y}{x+y}\right)$ નું સાદું રૂપ શું થાય?

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