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

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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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