Write the following expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression. 2 sin 67.5 cos 67.5 Write the following expression as the sine, cosine, or tangent of a double angle. Select the correct choice below and fill in the answer box to complete your choice. (Simplify your answer. Type your answer in degrees. Use integers or decimals for any numbers in the expression.) O A. 2 sin 67.5 cos 67.5 = tan O O B. 2 sin 67.5 cos 67.5 = cos O O C. 2 sin 67.5 cos 67.5 = sin o