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Problem
Problem
Find the number of solutions of
∣
cos
x
∣
=
sin
x
,
0
≤
x
≤
4
π
|\cos x| = \sin x, 0 \le x \le 4\pi
∣
cos
x
∣
=
sin
x
,
0
≤
x
≤
4
π
.
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