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5. Find the exact value of each trigonometric expression. (a) cos 70 cos 50 - sin 70 sin 50 5 (Cos (70-50) (11T)

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5. Find the exact value of each trigonometric expression. (a) cos 70 cos 50 - sin 70 sin 50 5 (Cos (70-50) (11T)

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