differentiation

Question: If $f(x)=\frac{{{x}^{2}}-1}{{{x}^{2}}+1}$ , for every real number x, then the minimum value of f



1) Does not exist because f is unbounded
2) Is not attained even though f is bounded
3) Is equal to 1
4) Is equal to –1
Solution: Explanation: No Explanation
Maxima and Minima

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