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2 \cos^{- 1} x = ?

\cos^{- 1} (1 - 2 x^{2})

\cos^{- 1} (3 x - 2 x^{3}) =

\cos^{- 1} (2 x^{2} - 1)

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

ANS : 3

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