$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

  • A
    $\frac{\pi}{4}$
  • B
    $0$
  • C
    $\tan ^{-1}\left(\frac{5}{4}\right)$
  • D
    $\frac{\pi}{2}$

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જો $x * y = x^{2} + y^{3}$ અને $(x * 1) * 1 = x * (1 * 1)$ હોય,તો $2 \sin^{-1}\left(\frac{x^{4} + x^{2} - 2}{x^{4} + x^{2} + 2}\right)$ ની કિંમત શોધો.

જો $\tan ^{-1} x + \tan ^{-1} y + \tan ^{-1} z = \frac{\pi}{2}$,જ્યાં $x, y, z > 0$ અને $xy < 1$ હોય,તો $xy + yz + zx$ ની કિંમત શોધો:

જો $\sin ^{ - 1}\frac{{2a}}{{1 + {a^2}}} - \cos ^{ - 1}\frac{{1 - {b^2}}}{{1 + {b^2}}} = \tan ^{ - 1}\frac{{2x}}{{1 - {x^2}}}$,હોય,તો $x = $

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$2 \tan^{-1} \frac{1}{2} + \tan^{-1} \frac{1}{7}$ ની કિંમત શોધો.

સાબિત કરો કે $2 \tan ^{-1} \frac{1}{2} + \tan ^{-1} \frac{1}{7} = \tan ^{-1} \frac{31}{17}$.

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