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Using the sum and difference of cosines formula, find the exact value of cos 571 12 Enclose numerators and denominators in parentheses. For example, (a

Using the sum and difference of cosines formula, find the exact value of cos 571 12 Enclose numerators and denominators in parentheses. For example, (a - b) / (1 + n). sin (a) OO ? 5 7T 4 COS = 12

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