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The range of f(x)=sin^(-1)((x^2+1)/(x^2+...

The range of `f(x)=sin^(-1)((x^2+1)/(x^2+2))` is (a)`[0,pi/2]` (b) `(0,pi/6)` (c) `[pi/6,pi/2]` (d) none of these

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