SOLUTION: Find the exact value of each trig expression Cos (-pi/12)

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Question 971587: Find the exact value of each trig expression
Cos (-pi/12)
Answer by Alan3354(69443) About Me  (Show Source):
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Find the exact value of each trig expression
Cos (-pi/12)
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= cos(pi/12) = cos(15) degs
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cos%5E2%2815%29+=+%281+%2B+sqrt%283%29%2F2%29%2F2
cos%2815%29+=+sqrt%282+%2B+sqrt%283%29%29%2F2