Express the Sum or Difference as a Product of Sines $$\cos \frac { 5 \theta } { 2 } + \cos \frac { 3 \theta } { 2 }$$

question 161

Multiple Choice

Express the sum or difference as a product of sines and/or cosines.
- $$\cos \frac { 5 \theta } { 2 } + \cos \frac { 3 \theta } { 2 }$$

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

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