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6. Find the exact value of each of the following expressions: a) sin 20 cos 80 - cos 20 sin 80 5 JT b) cos

6. Find the exact value of each of the following expressions: a) sin 20 cos 80 - cos 20 sin 80 5 JT b) cos COS + sin sin 12 12 12 12 tan 40 - tan 100 C) 1 + tan 40 tan 100

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