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Problem
Problem
Find the set of critical points of the function
f
(
x
)
=
x
−
log
x
+
∫
2
x
(
1
z
−
2
−
2
cos
4
z
)
d
z
.
f(x) = x - \log x + \int_{2}^{x} \left( \frac{1}{z} - 2 - 2\cos 4z \right) dz.
f
(
x
)
=
x
−
lo
g
x
+
∫
2
x
(
z
1
−
2
−
2
cos
4
z
)
d
z
.
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