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Mathematics
Mathematics
Problem
Find all real values of
k
k
k
for which the function
f
:
R
→
R
f:\mathbb R\to \mathbb R
f
:
R
→
R
defined by
f
(
x
)
=
x
3
+
k
x
f(x)=x^{3}+kx
f
(
x
)
=
x
3
+
k
x
is invertible.
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