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$\frac{1}{2} \sin^{- 1} \frac{4}{5} = ?$

t a n^{- 1} (\frac{1}{2})

t a n^{- 1} (2)

\cos^{- 1} (\frac{3}{4})

\sin^{- 1} (\frac{2}{5})

ANS : 1

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