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Mathematics
Mathematics
Problem
If
cos
x
=
3
2
\cos x = \dfrac{\sqrt{3}}{2}
cos
x
=
2
3
and
0
<
x
<
π
2
0 < x < \dfrac{\pi}{2}
0
<
x
<
2
π
, find the exact value of
cos
3
x
\cos 3x
cos
3
x
.
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