MCQ
$\sin \left(\frac{1}{2} \cos ^{-1} \frac{4}{5}\right)=$
- A$\frac{1}{\sqrt{5}}$
- B$\frac{2}{\sqrt{5}}$
- ✓$\frac{1}{\sqrt{10}}$
- D$\frac{2}{\sqrt{10}}$
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