Freeflows

Polynomial With Cosine Root

Find the cubic polynomial, in $ x, $ with integer coefficients that has $ \cos 20^\circ $ as a root. The coefficient of $ x^3 $ should be positive, and the coefficients should have no common factor other than 1.

1
2
3
+
4
5
6
-
7
8
9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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