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Mathematics
Problem
For
f
(
x
)
=
∣
x
∣
x
2
+
1
f(x)=\dfrac{|x|}{x^{2}+1}
f
(
x
)
=
x
2
+
1
∣
x
∣
, determine the domain of
f
′
f'
f
′
in interval notation.
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