$\sin \left( \frac{1}{2} \cos^{-1} \frac{4}{5} \right) = $

  • A
    $\frac{1}{\sqrt{10}}$
  • B
    $-\frac{1}{\sqrt{10}}$
  • C
    $\frac{1}{10}$
  • D
    $-\frac{1}{10}$

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