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Mathematics
Problem
Determine the number of distinct solutions of
cos
5
x
=
cos
x
\cos 5x = \cos x
cos
5
x
=
cos
x
in the interval
0
≤
x
<
2
π
0\le x<2\pi
0
≤
x
<
2
π
. a)
6
6
6
b)
10
10
10
c)
8
8
8
d)
9
9
9
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