# Tag algebraic

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 T61: $\cos(\pi x)$ for rational $x$ (938 numbers) T35: Algebraic numbers of degree 2 (848 numbers) T60: Roots of unity (772 numbers) T68: $j$-invariants of elliptic curves over quadratic fields with everywhere good reduction (395 numbers) T17: Area of the regular n-gon (294 numbers) T85: Volume of the Platonic solids (25 numbers) T86: Surface area of the Platonic solids (25 numbers) T32: Golden ratio (2 numbers)