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If f(x)=(x^(2)-1)/(x^(2)+1), for every r...

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

Text Solution

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The correct Answer is:
D
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