જો $\cot^{-1} \alpha + \cot^{-1} \beta = \cot^{-1} x$ હોય,તો $x = $

  • A
    $\alpha + \beta$
  • B
    $\alpha - \beta$
  • C
    $\frac{1 + \alpha \beta}{\alpha + \beta}$
  • D
    $\frac{\alpha \beta - 1}{\alpha + \beta}$

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સાબિત કરો કે $3 \cos ^{-1} x = \cos ^{-1} (4 x^{3} - 3 x)$,જ્યાં $x \in [\frac{1}{2}, 1]$.

કિંમત શોધો: $\tan^{-1} \left( \frac{1 - x^2}{2x} \right) + \cos^{-1} \left( \frac{1 - x^2}{1 + x^2} \right)$

$(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8} \Rightarrow x=$

$\cot ^{ - 1}\left[ \frac{\sqrt {1 - \sin x} + \sqrt {1 + \sin x}}{\sqrt {1 - \sin x} - \sqrt {1 + \sin x}} \right] = $

જો $f(x) = 2 \tan^{-1} x + \sin^{-1} \left( \frac{2x}{1 + x^2} \right)$,જ્યાં $x > 1$,તો $f(5)$ ની કિંમત શોધો:

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