In the following problem, the expression is the right side of the formula for cos(a - B) with particular values for a and B. COS 7μ (727) CO 12 The value of a is COS a. Identify a and ß in the expression. 71 T COS + sin JU 4 The value of ß is b. Write the expression as the cosine of an angle. The expression is cos c. Find the exact value of the expression. 7π (72) Sin (1) - 12 12 4 (Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all denominators. Simplify your answer.) 7μ 12 sin + sin T 4 Next

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