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BMT 2013 Spring - Analysis 6

Source:

January 6, 2022
algebraPolynomialstrigonometry

Problem Statement

The minimal polynomial of a complex number rr is the unique polynomial with rational coefficients of minimal degree with leading coefficient 11 that has rr as a root. If ff is the minimal polynomial of cos⁡π7\cos\frac\pi7, what is f(−1)f(-1)?
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