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Problem
Problem
If
f
:
R
→
R
f : R \to R
f
:
R
→
R
is the function defined by
f
(
x
)
=
e
x
2
−
e
−
x
2
e
x
2
+
e
−
x
2
f(x) = \frac{e^{x^2} - e^{-x^2}}{e^{x^2} + e^{-x^2}}
f
(
x
)
=
e
x
2
+
e
−
x
2
e
x
2
−
e
−
x
2
, then a.
f
(
x
)
f(x)
f
(
x
)
is an increasing function b.
f
(
x
)
f(x)
f
(
x
)
is a decreasing function c.
f
(
x
)
f(x)
f
(
x
)
is a onto d. None of the above
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