In Exercises 8992, find the exact values of sin 2u, cos 2u, and tan 2u using the
Chapter 6, Problem 90(choose chapter or problem)
In Exercises 89–92, find the exact values of sin 2u, cos 2u, and tan 2u using the double-angle formulas.
\(\cos u=\frac{4}{5}, \quad \frac{3 \pi}{2}<u<2 \pi\)
Text Transcription:
cos u = 4/5 , 3 pi / 2 < u < 2 pi
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