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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. COS

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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. COS 72 COS -# + sin( 12 sim ( ) 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 C. Find the exact value of the expression. cos (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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