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Use the sum and difference formulas to find the exact value of cos(255 degrees)

Use the sum and difference formulas to find the exact value of cos(255 degrees)

Which of these is the correct answer?

A. (-√2 + √6)/4
B. (√2 - √6)/4
C. (√2 + √6)/4
D. (-√2 - √6)/4

[show your steps in completing this problem]

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Sum and difference formulas are used to find the exact value of cos(255 degrees). The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.

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