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Find the exact value of cos pi/12 using half angle identity?

Resolved Question:

Find the exact value of cos pi/12 using half angle identity. simplify,including any radicals. Use integers or fractions for any numbers in the expression.Rationalize all denominators.

That depends on if they are asking for a value or an expression.

If they want a value, then it is 0.9659, when rounded to four decimal places.

If they want an expression, then it could be ±√((1 + cos pi/6) / 2). In this case though, it would be helpful to see the answer choices that are available (if it is multiple choice).