Use a Calculator to Decide Whether the Statement Is True $$\cos \left( 2 \cdot 90 ^ { \circ } \right) = \cos ^ { 2 } 90 ^ { \circ } - \sin ^ { 2 } 90 ^ { \circ }$$

question 69

Multiple Choice

Use a calculator to decide whether the statement is true or false.
- $$\cos \left( 2 \cdot 90 ^ { \circ } \right) = \cos ^ { 2 } 90 ^ { \circ } - \sin ^ { 2 } 90 ^ { \circ }$$

• A) True
• B) False

---

Definitions:

Demand Curve

A graph showing the relationship between the price of a good and the amount of the good that consumers are willing and able to purchase, ceteris paribus.

Herfindahl Indexes

A measure used to calculate the level of concentration in a market, indicating the competitive environment and potential for monopolistic power.

Four-Firm Concentration Ratio

A measure that indicates the total market share held by the largest four firms in an industry, used to assess the level of competition.

Product Differentiation

Product differentiation is the process of distinguishing a product or service from similar offerings in the market to make it more attractive to a particular target market.