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Mathematics
Mathematics
Problem
Solve for
θ
\theta
θ
in the interval
0
∘
≤
θ
<
120
∘
0^{\circ}\le \theta<120^{\circ}
0
∘
≤
θ
<
12
0
∘
:
cos
3
θ
=
1
2
.
\cos 3\theta = \frac12.
cos
3
θ
=
2
1
.
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