Use reference angles to find the exact value of the following expression. n t _ co 3 ) n Determine the reference angle for 3 The reference angle is | |. (Type your answer in radians. Use integers or fractions for any numbers in the expression. Type an exact answer, using as needed.) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A 7n cot 3 " (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize the denominator.) (O B. The answer is undefined