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Mathematics
Mathematics
Problem
18. If
f
(
x
)
=
∣
x
∣
3
f(x)=|x|^{3}
f
(
x
)
=
∣
x
∣
3
, show that
f
′
′
(
x
)
f^{\prime \prime}(x)
f
′′
(
x
)
exists for all real
x
x
x
and find it.
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