Find the Exact Value $\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )$

question 7

Essay

Find the exact value. $\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )$

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Definitions:

Income

refers to the money received, especially on a regular basis, for work or through investments.

Individual-Level Explanation

An approach to understanding phenomena by looking at the individual factors, such as personal choices and behaviors, that contribute to the outcome.

Macrolevel Explanation

An explanation that focuses on large-scale social processes and structures, considering the broader societal context.

Culture-Of-Poverty

A concept in social theory that asserts that poverty is not only a lack of economic resources but also develops a culture that perpetuates poverty.