Verify the identity. cos (a - B) cos (a + ß) = cos 2ß - sin 2a %3D Write the left side of the identity using the sum and difference formula. (Type the terms of your expression in the same order as they appear in the original expression.) Use the distributive property to simplify the expression from the previous step. O (Simplify your answer.) Substitute 1- cos B for sin ß in the expression from the previous step and distribute. Regroup and factor the expression from the previous step. Do not apply any trigonometric identities yet. The expression from the previous step then simplifies to cos 2B - sin2a using what? A. Cancellation Property B. Pythagorean Identity C. Even-Odd Identity D. Quotient ldentity O E. Reciprocal Identity

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