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8) Use the addition or subtraction formula to find the exact value without the aid of a calculator. a) sin 420 cos 120 - cos

8) Use the addition or subtraction formula to find the exact value without the aid of a calculator. a) sin 420 cos 120 - cos 420 sin 120 b) sin 12 9) Use the half-angle formula to find the exact value of a) sin 1050 b) cos = NB: half-angle must be written in radians given value of t

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