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\sin^{- 1} x + \tan^{- 1} \frac{x}{\sqrt{1 - x^{2}}} = ?

2 \cos^{- 1} x

\frac{π}{2} + \sin^{- 1} x

π - \sin^{- 1} x

π - 2 \cos^{- 1} x

π - 2 \sin^{- 1} x

ANS : 4

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