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Mathematics
Mathematics
Problem
Solve
cos
2
θ
=
1
2
\cos 2\theta = \dfrac{1}{2}
cos
2
θ
=
2
1
for all
θ
\theta
θ
in the interval
[
0
,
2
π
)
[0,2\pi)
[
0
,
2
π
)
.
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