Question: Question 7: (9 points) Using the sum and difference of cosines formula, find the exact value of cos 57 12 Enclose numerators and denominators in

Question 7: (9 points) Using the sum and difference of cosines formula, find the exact value of cos 57 12 Enclose numerators and denominators in parentheses. For example, (a - b) / (1 + n)
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