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

  • A
    $\frac{{a - b}}{{1 + ab}}$
  • B
    $\frac{b}{{1 + ab}}$
  • C
    $\frac{b}{{1 - ab}}$
  • D
    $\frac{{a + b}}{{1 - ab}}$

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