Write the expression as the sine, cosine, or tangent of a double-angle. Then find the exact value of the expression. cos 135° - sin 135° 2. Which expression is cos 135° - sin 135° equal to? Select the correct choice below and fill in the answer box within your choice. (Simplify your answer. Type yoOur answer in degrees. Use integers or decimals for any numbers in the expression.) A. cos 135°- sin2135° = sin O B. cos 135° - sin 135° = tan OC. cos2135°- sin2135° = c ECOS The exact value of the expression is (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Rationalize the denominator)

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