Use the Sum-To-Product Formulas to Write the Given Expression as a Product

question 115

Multiple Choice

Use the sum-to-product formulas to write the given expression as a product. $\cos 8 \theta - \cos 6 \theta$

• A) \(- 2 \sin 7 \theta \sin \theta\)
• B) \(2 \cos 7 \theta \cos \theta\)
• C) \(2 \cos 7 \theta \sin \theta\)
• D) \(2 \sin 7 \theta \cos \theta\)
• E) \(- 2 \cos 7 \theta \cos \theta\)