Use a half-angle formula to find the exact value of the following expression. sin 165° Determine an appropriate half-angle formula for sine and the measure of the angle. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal.) O A. O B. O C. O D. sin 165° = sin 165° = - sin 165° = sin 165° = == 1 - cos 2 1 - cos 2 1 + cos 2 1 + cos 2 O O O ... O sin 165° = (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Rationalize the denominator.) Next