Express the Product as a Sum or Difference $\sin 3 x \sin 7 x$

question 220

Multiple Choice

Express the product as a sum or difference.
- $\sin 3 x \sin 7 x$

• A) \(\frac { 1 } { 2 } ( \cos 4 x - \cos 10 x )\)
• B) \(\frac { 1 } { 2 } ( \cos 10 x - \sin 4 x )\)
• C) \(\frac { 1 } { 2 } ( - \cos 4 x - \cos 10 x )\)
• D) \(\sin ^ { 2 } 21 x ^ { 2 }\)

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