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Mathematics
Problem
Find the values of
x
x
x
for which the rate of change of
x
4
+
x
3
−
x
x^4 + x^3 - x
x
4
+
x
3
−
x
is more than the rate of change of
x
4
4
\frac{x^4}{4}
4
x
4
.
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