Question: 5. Use the Sum and Difference Identities to answer the following: a. Determine the exact value of cos- 1375 Give the simplest reduce answer. (Hint:

5. Use the Sum and Difference Identities to answer the following: a. Determine the exact value of cos- 1375 Give the simplest reduce answer. (Hint: The 12 solution should be stated as one fraction with a rational denominator.) (2 marks) b. Simplify cos (0-7) -sin (7 + 0) (2 marks)

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