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# 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. (-&#8730;2 + &#8730;6)/4
B. (&#8730;2 - &#8730;6)/4
C. (&#8730;2 + &#8730;6)/4
D. (-&#8730;2 - &#8730;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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