Use identities to find the exact value of the expression. Do not use a calculator. sin 12 Choose the correct expanded form of sin using the sum or difference formula for sine. 12 O A. sin = sin = COS COS - sin 12 4 4 3 4 sin 3 O B. sin = sin + = sin - COS - + cos - sin 12 4 6 4 O C. sin = sin = COS COS ~ + sin sin