Use the Product-To-Sum Formulas to Rewrite the Product as a Sum

question 20

Multiple Choice

Use the product-to-sum formulas to rewrite the product as a sum or difference.​ $$8 \sin 65 ^ { \circ } \cos 25 ^ { \circ }$$ ​

• A)​ \(8 \left( \sin 90 ^ { \circ } + \sin 40 ^ { \circ } \right)\)
• B)​ \(4 \left( \cos 90 ^ { \circ } + \cos 40 ^ { \circ } \right)\)
• C)​ \(4 \left( \cos 90 ^ { \circ } - \cos 40 ^ { \circ } \right)\)
• D)​ \(\left( \sin 90 ^ { \circ } + \sin 40 ^ { \circ } \right)\)
• E)​ \(4 \left( \sin 90 ^ { \circ } + \sin 40 ^ { \circ } \right)\)

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