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If f(x)=cos^(-1)((2x^2+1)/(x^2+1)), then...

If `f(x)=cos^(-1)((2x^2+1)/(x^2+1)),` then rang of `f(x)` is `[0,pi]` (2) `(0,pi/4]` `(0,pi/3]` (4) `[0,pi/2)`

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