Use a Product-To-Sum Formula to Convert the Expression to a Sum

question 6

Multiple Choice

Use a product-to-sum formula to convert the expression to a sum or difference. Simplify where possible. $\cos 47 ^ { \circ } \cos 43 ^ { \circ }$

• A) \(\frac { 1 } { 2 } \left( 1 + \sin 4 ^ { \circ } \right)\)
• B) \(\sqrt { 2 } \cos 2 ^ { \circ }\)
• C) \(\frac { 1 } { 2 } \cos 4 ^ { \circ }\)
• D) \(- \frac { 1 } { 2 } \cos 4 ^ { \circ }\)
• E) \(\frac { 1 } { 2 } \left( 1 - \sin 4 ^ { \circ } \right)\)

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