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The range of $f (x) = \sin^{- 1} x + \tan^{- 1} x + \sec^{- 1} x$ is

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π4,3π4

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Correct option is C

f(x)=sin−1x+tan−1x+sec−1x; clearly, the domain of f(x) is x=±1. Thus the range is f(1),f(−1)=π4,3π4.

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The range of f(x)=sin−1x+tan−1x+sec−1x is

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The range of $f (x) = \sin^{- 1} x + \tan^{- 1} x + \sec^{- 1} x$ is