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

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If \( f(x)=\frac{x^{2}-1}{x^{2}+1} \), for every real number \( x \), then the minimum value of \( f \)
(a) does not exist because \( f \) is unbounded
(b) is not attained even though \( f \) is bounded
(c) is 1
(d) is -1
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