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Question 5 5. Answer the following. (a) (6 points) Without using a calculator, find the exact value of cos (839 ) cos(239 ) + sin(83)

Question 5 5. Answer the following. (a) (6 points) Without using a calculator, find the exact value of cos (839 ) cos(239 ) + sin(83) sin(23) (b) (6 points) Prove the following identity cos (3.r) - cos' () - - cos(c) sin (@) - sin() sin(2:)

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