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Maths-

General

Easy

Question

If $f open parentheses x close parentheses equals fraction numerator x to the power of 2 end exponent minus 1 over denominator x to the power of 2 end exponent plus 1 end fraction comma$ for every real number, then minimum value of f

does not exist
is not attained even though f is bounded
is equal to 1
is equal to -1

The correct answer is: is equal to -1

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