Use a Calculator to Decide Whether the Statement Is True

question 129

True/False

Use a calculator to decide whether the statement is true or false.
-cos (2 ·30°)= 2 · cos 30°

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Definitions:

Homestead Strike

A major labor strike in 1892 at the Homestead Steel Works in Pennsylvania, notable for its violence and the use of Pinkerton agents.

American Freedom

A broad concept reflecting the values and liberties championed by the United States, such as freedom of speech, religion, and the pursuit of happiness, as outlined in founding documents like the Constitution and the Declaration of Independence.

1890s

The decade extending from January 1, 1890, to December 31, 1899, characterized by significant social, economic, and political change.

Annexation

The formal process by which a state takes over the territory of another state, usually without the agreement of the latter.