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Problem
Problem
If
f
(
x
)
=
x
2
−
1
x
2
+
1
f(x) = \frac{x^2-1}{x^2+1}
f
(
x
)
=
x
2
+
1
x
2
−
1
, for every real numbers. then the minimum value of
f
f
f
a. Does not exist because
f
f
f
is bounded b. Is not attained even through
f
f
f
is bounded c. Is equal to
+
1
+1
+
1
d. Is equal to
−
1
-1
−
1
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