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Mathematics
Problem
Let
h
(
x
)
=
x
2
−
4
x
2
+
4
h(x)=\dfrac{x^{2}-4}{x^{2}+4}
h
(
x
)
=
x
2
+
4
x
2
−
4
. Determine all intervals on which
h
h
h
is concave up and all intervals on which
h
h
h
is concave down.
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