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Here is a link to the question:Help with precalculus! Sum or difference formula?

Find the exact value of the given expression using a sum or difference formula.

cos11π/12

A) (sqrt3 - 1)/(2sqrt2)

B) (-sqrt3 + 1)/(2sqrt2)

C) (-sqrt3 - 1)/(2sqrt2)

D) (sqrt3 +1)/(2sqrt2)

Help with precalculus! Sum or difference formula? - Yahoo! Answers

I have posted a link there to this question so the OP can find my response.