Use one or more of the six sum and difference identities to find the exact value of the express sin (45 -30) Rewrite the expression using a sum or difference formula. Choose the correct answer below. A. sin 45 cos 30 + cos 45 sin 30 B. sin 30 cos 30 - sin 45 cos 45 C. cos 30 cos 30 + sin 45 sin 45 D. sin 45 cos 30 - cos 45 sin 30 Find the exact value of the expression. sin (45 -30) = (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fracti the expression. Rationalize all denominators.)