Express the Sum or Difference as a Product $$\cos \frac { 7 x } { 2 } + \cos \frac { 5 x } { 2 }$$

question 104

Multiple Choice

Express the sum or difference as a product.
- $$\cos \frac { 7 x } { 2 } + \cos \frac { 5 x } { 2 }$$

• A) \(2 \cos 3 x \cos \frac { x } { 2 }\)
• B) \(2 \sin 3 x \sin x\)
• C) \(2 \sin 3 x \sin \frac { x } { 2 }\)
• D) \(2 \cos 3 x\)

---

Definitions:

Uncertainty

The state of having limited knowledge where it is impossible to exactly describe existing states, outcomes, or future events.

Individual Mandate

A requirement for individuals to have health insurance or pay a penalty, originally a key provision of the Affordable Care Act.

Affordable Care Act

The Affordable Care Act, also known as Obamacare, is a law enacted to increase health insurance quality and affordability, and lower the uninsured rate by expanding public and private insurance coverage.

Adverse Selection

A situation where sellers have information that buyers do not have, or vice versa, leading to an unbalanced and inefficient market.