Write the expression as the sine, cosine, or tangent of a double-angle. Then find the exact value of the expression. cos 2135° - sin 2135° ... Which expression is cos 2135° - sin2135° equal to? Select the correct choice below and fill in the answer box within your choice. (Simplify your answer. Type your answer in degrees. Use integers or decimals for any numbers in the expression.) O A. cos2135° - sin ²135° = c = COS OB. cos2135° - sin ²135° = tan OC. cos²135° - sin ²135° = sin O O O

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