ધારો કે $0 < \alpha < 1$, $\beta = \frac{1}{3\alpha}$, અને $\tan^{-1}(1 - \alpha) + \tan^{-1}(1 - \beta) = \frac{\pi}{4}$ છે. તો $6(\alpha + \beta)$ ની કિંમત શોધો:

  • A
    $6$
  • B
    $7$
  • C
    $8$
  • D
    $9$

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જો $|x|>1$ માટે, $\tanh ^{-1}\left(\frac{1}{x}\right)+\operatorname{coth}^{-1}(x)=\log _e(f(x))$ હોય, તો $f(-5)=$

સાબિત કરો કે $\frac{9 \pi}{8} - \frac{9}{4} \sin^{-1} \frac{1}{3} = \frac{9}{4} \sin^{-1} \frac{2 \sqrt{2}}{3}$.

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જો $0 < |x| < \sqrt 2$ માટે ${\sin ^{ - 1}}\left( {x - \frac{{{x^2}}}{2} + \frac{{{x^3}}}{4} - \dots} \right) + {\cos ^{ - 1}}\left( {{x^2} - \frac{{{x^4}}}{2} + \frac{{{x^6}}}{4} - \dots} \right) = \frac{\pi }{2}$ હોય,તો $x$ ની કિંમત શોધો.

$\tan \left[2 \tan ^{-1}\left(\frac{1}{5}\right)-\frac{\pi}{4}\right]$ નું મૂલ્ય શોધો.

કિંમત શોધો: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

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