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

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Definitions:

Vertical Straight Line

In a graph, a line that runs straight up and down, indicating that the variable on the x-axis remains constant.

Quantity Supplied

The quantity of a product or service that sellers are prepared and capable of offering for sale at a certain price.

Production Costs

The total expense incurred in manufacturing goods, including raw materials, labor, and overhead.

Price

The amount of money expected, required, or given in payment for something, reflecting its value or worth in a market.