Express the Sum or Difference as a Product $$\sin \frac { 9 x } { 2 } + \sin \frac { 5 x } { 2 }$$

question 114

Multiple Choice

Express the sum or difference as a product.
- $$\sin \frac { 9 x } { 2 } + \sin \frac { 5 x } { 2 }$$

• A) \(2 \sin \frac { 7 x } { 2 } \cos x\)
• B) \(2 \sin \frac { 7 x } { 2 } \sin x\)
• C) \(2 \cos 7 x \sin x\)
• D) \(2 \sin 7 x\)

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