Complete the Sentence So the Result Is an Identity $2 \sin 8 x \sin 17 x$

question 272

Multiple Choice

Complete the sentence so the result is an identity. Let x be any real number.
- $2 \sin 8 x \sin 17 x$

• A) \(\sin 25 x + \sin 9 x\)
• B) \(\frac { 1 } { 2 } ( \cos 25 x + \cos 9 x )\)
• C) \(\cos 25 x + \cos 9 x\)
• D) \(\cos 9 x - \cos 25 x\)

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