WHAT IS THE FORMULA FOR (SinA-SinB)
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sin 2A = 2 sin A cos A
16. cos 2A = cos 2 A - sin 2 A = 2 cos 2A - 1 = 1 - 2 sin 2 A
17. sin 3A = 3 sin A - 4 sin 3 A
18. cos 3A = 4 cos 3 A - 3 cos A
16. cos 2A = cos 2 A - sin 2 A = 2 cos 2A - 1 = 1 - 2 sin 2 A
17. sin 3A = 3 sin A - 4 sin 3 A
18. cos 3A = 4 cos 3 A - 3 cos A
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