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

Multiple Choice

Use the product-to-sum formula to write the given product as a sum or difference.
$$10 \sin \frac { \pi } { 8 } \cos \frac { \pi } { 8 }$$

A) $5 \sin \frac { \pi } { 8 } + 5 \cos \frac { \pi } { 8 }$
B) $5 \sin \frac { \pi } { 4 }$
C) $5 + 5 \cos \frac { \pi } { 16 }$
D) $5 - 5 \cos \frac { \pi } { 16 }$
E) $- 5 \sin \frac { \pi } { 16 }$