Express the Sum or Difference as a Product of Sines $$\sin \frac { 7 \theta } { 2 } + \sin \frac { 3 \theta } { 2 }$$

Multiple Choice

Express the sum or difference as a product of sines and/or cosines.
- $$\sin \frac { 7 \theta } { 2 } + \sin \frac { 3 \theta } { 2 }$$

A) $2 \sin \frac { 5 \theta } { 2 } \sin \theta$
B) $2 \sin ( 5 \theta )$
C) $2 \cos ( 5 \theta ) \sin \theta$
D) $2 \sin \frac { 5 \theta } { 2 } \cos \theta$