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Problem
Problem
Find the exact values of: a.
cos
2
π
3
\cos \frac{2\pi}{3}
cos
3
2
π
,
sin
2
π
3
\sin \frac{2\pi}{3}
sin
3
2
π
, and
tan
2
π
3
\tan \frac{2\pi}{3}
tan
3
2
π
b.
cos
(
−
π
4
)
\cos(-\frac{\pi}{4})
cos
(
−
4
π
)
,
sin
(
−
π
4
)
\sin(-\frac{\pi}{4})
sin
(
−
4
π
)
, and
tan
(
−
π
4
)
\tan(-\frac{\pi}{4})
tan
(
−
4
π
)
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