Express the Product as a Sum or Difference $\cos \frac { 7 x } { 2 } \cos \frac { x } { 2 }$

question 97

Multiple Choice

Express the product as a sum or difference.
- $\cos \frac { 7 x } { 2 } \cos \frac { x } { 2 }$

• A) \(\frac { 1 } { 2 } ( \cos 3 x + \cos 4 x )\)
• B) \(\frac { 1 } { 4 } ( \cos 8 x - \sin 6 x )\)
• C) \(\frac { 1 } { 4 } \cos ^ { 2 } 7 x\)
• D) \(\frac { 1 } { 2 } ( \cos 4 x - \sin 3 x )\)

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The emotional closeness and trust shared between people, allowing them to share their innermost thoughts and feelings.

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