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In the following problem, the expression is the right side of the formula for cos(a - B) with particular values for a and B. a.

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In the following problem, the expression is the right side of the formula for cos(a - B) with particular values for a and B. a. Identify a and B in the expression. The value of a is The value of B is b. Write the expression as the cosine of an angle. The expression is cos 7 c. Find the exact value of the expression. cos cos * IS + sin (2) sin (= ] - (Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all denominators. Simplify your answer.)

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