Use the method of Section 3.3.2 to prove the following results: (a) sin 30 = 3 cos0

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Use the method of Section 3.3.2 to prove the following results:

(a) sin 30 = 3 cos0 sin 0 sin0 (b) cos 80 = 128 cos0 - 256 cos 0 + 160 cos0 - 32 cos0 + 1 (c) tan 50 = 5 tan

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