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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. (-√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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    https://brainmass.com/math/trigonometry/sum-difference-formulas-exact-value-45714

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