$\sin \left(\tan ^{-1} \frac{4}{5}+\tan ^{-1} \frac{4}{3}+\tan ^{-1} \frac{1}{9}-\tan ^{-1} \frac{1}{7}\right) = $

  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\frac{\sqrt{3}}{2}$
  • D
    $1$

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