Use the Sum-To-Product Formulas to Rewrite the Sum or Difference $\cos \frac { 11 \theta } { 2 } \cos \frac { 5 \theta } { 2 }$

question 29

Multiple Choice

Use the sum-to-product formulas to rewrite the sum or difference as a product. ​
Cos 3θ + cos 8θ
​

• A)​ \(\cos \frac { 11 \theta } { 2 } \cos \frac { 5 \theta } { 2 }\)
• B)​ \(2 \cos \frac { 11 \theta } { 2 } \sin - \frac { 5 \theta } { 2 }\)
• C)​ \(2 \sin \frac { 11 \theta } { 2 } \sin \frac { 5 \theta } { 2 }\)
• D)​ \(\cos - \frac { 11 \theta } { 2 } \cos \frac { 5 \theta } { 2 }\)
• E) \(2 \cos \frac { 11 \theta } { 2 } \cos - \frac { 5 \theta } { 2 }\)

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