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Evaluate the trigonometric function of the given quadrantal angle. If the value is undefined, write "undefined."
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W.B. Du Bois
An influential American sociologist, historian, and civil rights activist, co-founder of the NAACP, who advocated for the rights and advancement of Black Americans.
Progressive
Refers to a range of political and social reform movements aimed at addressing issues of inequality, corruption, and inefficiency in government and society.
Red Scare
A period of intense fear or paranoia about communism and its potential spread in the United States, leading to widespread suspicion and discrimination against perceived communists.
Political Intolerance
The lack of willingness to allow or accept opposing political views, resulting in a potentially oppressive or hostile environment for differing political beliefs.
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