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

  • A
    $\frac{6\pi - 4}{5}$
  • B
    $\frac{6\pi + 4}{5}$
  • C
    $\frac{5\pi - 4}{6}$
  • D
    $\frac{5\pi + 4}{6}$

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

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