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Mathematics
Problem
Which one of the following real-valued functions on
R
\mathbb R
R
is NOT injective? a)
f
(
x
)
=
x
3
f(x)=x^3
f
(
x
)
=
x
3
b)
h
(
x
)
=
∣
x
∣
h(x)=|x|
h
(
x
)
=
∣
x
∣
c)
g
(
x
)
=
x
3
g(x)=\sqrt[3]{x}
g
(
x
)
=
3
x
d)
p
(
x
)
=
tan
−
1
x
p(x)=\tan^{-1}x
p
(
x
)
=
tan
−
1
x
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