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Mathematics
Problem
Explain why the function
f
(
x
)
=
3
x
+
1
x
2
+
4
f(x)=\dfrac{3x+1}{x^{2}+4}
f
(
x
)
=
x
2
+
4
3
x
+
1
is defined for every real number
x
x
x
.
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