Use the Product-To-Sum Formula to Write the Given Product as a Sum

question 20

Multiple Choice

Use the product-to-sum formula to write the given product as a sum or difference.
$8 \sin \frac { \pi } { 8 } \sin \frac { \pi } { 8 }$

• A) \(4 \sin \frac { \pi } { 16 }\)
• B) \(4 - 4 \cos \frac { \pi } { 4 }\)
• C) \(4 + 4 \cos \frac { \pi } { 16 }\)
• D) \(- 4 \sin \frac { \pi } { 16 }\)
• E) \(4 \sin \frac { \pi } { 8 } + 4 \cos \frac { \pi } { 8 }\)

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