Write the Sum as a Product $\sin 4 x + \sin 5 x$

question 89

Multiple Choice

Write the sum as a product. $\sin 4 x + \sin 5 x$

• A) \(\sin 4 x \sin 5 x\)
• B) \(\sin 4 x \cos 5 x\)
• C) \(2 \sin ( 9 x / 2 ) \cos ( x / 2 )\)
• D) \(\sin 4 x \cos ( x / 2 )\)
• E) \(2 \sin 3 x \cos ( x / 2 )\)

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