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

The range of `f(x)=cos^(-1)((1+x^2)/(2x))+sqrt(2-x^2)` is `{0,1+pi/2}` (b) `{0,1+pi)` `{1,1+pi/2}` (d) `{1,1+pi}`

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