If ${\tan ^{ - 1}}x - {\tan ^{ - 1}}y = {\tan ^{ - 1}}A,$ then $A$ is equal to:

  • A
    $x - y$
  • B
    $x + y$
  • C
    $\frac{x - y}{1 + xy}$
  • D
    $\frac{x + y}{1 - xy}$

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