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Range of the function f(x)=tan^(-1)sq...

Range of the function `f(x)=tan^(-1)sqrt([x]+[-x])+sqrt(2-|x|)+1/(x^2)` is: a.`[1/4,oo)` b. `{1/4}uu[2,oo)` c.`{1/4,2}` d.`[1/4,2]`

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