Assertion: trigonometric function | /r/HasProperty | rational values
Facets:
value: for certain angles
type: OTHER
Source sentences:
text: For certain angles, the trigonometric functions are rational values; for other angles, they are irrational values, and some approximation is therefore necessary when working with decimals or fractions.
text: Trigonometric functions of angles that are rational multiples of 2π are algebraic numbers.