Question

Prove that $\cos(\pi/7)$ is root of equation $8x^3-4x^2-4x+1=0$

score 5.1k · Answer 1 · 2017-02-11 06:01:32

5.1k

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Prove that $\cos(\pi/7)$ is root of equation $8x^3-4x^2-4x+1=0$

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score 395 · Answer 8 · 2017-02-15 20:31:44

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score 229 · Answer 12 · 2017-02-19 09:12:49

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all values of $ \tan^2 3x \cos^2 x - 4\tan 3x \sin 2x + 16\sin^2 x$ lie in interval

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List Question

Prove that $\cos(\pi/7)$ is root of equation $8x^3-4x^2-4x+1=0$

Learning Complex Analysis - Resources and Techniques

Good source of questions and answers for studying Representation theory?

Papers related to prime numbers

Good book for a comprehensive course in modern algebra (categories, modules, groups, rings, fields, galois theory, and representation theory)?

show that in first countable hausdorff space every open set is G δ set?

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Vector spaces: how to prove the linear combination of $V_1$, $V_2$, and $V_3$ solve $z = ax+by$ + c

Which book should I use to learn Analysis?

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all values of $ \tan^2 3x \cos^2 x - 4\tan 3x \sin 2x + 16\sin^2 x$ lie in interval

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How to prove if the matrix-matrix product is valid in this question?

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