Question: 7. 2 sin 20 - 3 sin 0 = 0 9. cos 20 = 3 sin 0 - 1 11. 2 sin20 cos 0
7. 2 sin 20 - 3 sin 0 = 0 9. cos 20 = 3 sin 0 - 1 11. 2 sin20 cos 0 = 1 13. sin 0-1 = cos
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