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[" 59.If "f(x)=(x^(2)-1)/(x^(2)+1)" ,for...

[" 59.If "f(x)=(x^(2)-1)/(x^(2)+1)" ,for every real numbers.Then,the "],[" minimum value of "f],[" (a) does not exist because "f" is bounded "],[" (b) is not attained even through "f" is bounded "],[" (c) is equal to "+1],[" (d) is equal to "-1]

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