e/Trigonometric number

Information
has gloss	eng: In mathematics, a trigonometric number is an irrational number produced by taking the cosine of a rational multiple of a circle, or equivalently, the cosine in radians of a rational multiple of π, or the cosine of a rational number of degrees.
lexicalization	eng: Trigonometric number
instance of	(noun) a real number that cannot be expressed as a rational number irrational number, irrational