Express the Product as a Sum Containing Only Sines or Cosines

question 394

Multiple Choice

Express the product as a sum containing only sines or cosines.
- $2 \cos ( 7 \theta ) \cos \theta$

• A) \(\cos ( 10 \theta ) + \sin ( 4 \theta )\)
• B) \(\cos ( 14 \theta ) + \cos ( 2 \theta )\)
• C) \(\cos ( 8 \theta ) + \cos ( 6 \theta )\)
• D) \(\cos ( 8 \theta ) + \sin ( 6 \theta )\)

---

Definitions:

Psychosurgery

Surgical procedures that modify brain tissue in order to alleviate psychological disorders or behavioral problems.

Biomedical Intervention

Treatments or actions taken in the realm of medicine to improve mental or physical health conditions.

Behavior Change

The process through which individuals modify their actions or reactions, often aimed at achieving a specific outcome or improving well-being.

Bipolar Disorder

A mental health condition characterized by extreme mood swings, including emotional highs (mania) and lows (depression).