Noun
trigonometric function -
function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
circular function
mathematical function ,
single-valued function ,
map ,
mapping ,
function a diagrammatic representation of the earth's surface (or part of it)
sine ,
sin ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
arc sine ,
arcsin ,
arcsine ,
inverse sine the inverse function of the sine; the angle that has a sine equal to a given number
cosine ,
cos ratio of the adjacent side to the hypotenuse of a right-angled triangle
arc cosine ,
arccos ,
arccosine ,
inverse cosine the inverse function of the cosine; the angle that has a cosine equal to a given number
tangent ,
tan ratio of the opposite to the adjacent side of a right-angled triangle
arc tangent ,
arctan ,
arctangent ,
inverse tangent the inverse function of the tangent; the angle that has a tangent equal to a given number
cotan ,
cotangent ratio of the adjacent to the opposite side of a right-angled triangle
arc cotangent ,
arccotangent ,
inverse cotangent the inverse function of the cotangent; the angle that has a cotangent equal to a given number
secant ,
sec ratio of the hypotenuse to the adjacent side of a right-angled triangle
arc secant ,
arcsec ,
arcsecant ,
inverse secant the inverse function of the secant; the angle that has a secant equal to a given number
cosec ,
cosecant ratio of the hypotenuse to the opposite side of a right-angled triangle
