Directions: Solve each of the following problems.

Find the exact value of:

1. Cos 200 cos 45 0 + sin 20 0 sin 450

2. Cos 520 cos 320 – sin 520 sin 320

3. Sin 220 cos 380 + Cos 220 sin 380

4. Sin 850 cos 200 – Cos 850 sin 200

5. Cos 120 cos 100 – sin 120 sin 100

6. If sinx = 5/6, find Cos (2x)

7. If sinx = 7/9, find Cos (2x)

8. If sinx = 2/8, find Cos (3x)

9. If sinx = 4/8, find Cos (6x)

10. If sinx = 2/8, find Cos (1x)

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