- (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
- the sine of the complement of a given angle or arc. Abbreviation: cos
Words nearby cosine
How to use cosine in a sentence
The variables do not literally represent the angle measurements themselves, but instead stand in for complex numbers associated to the cosines of the angles.Tetrahedron Solutions Finally Proved Decades After Computer Search|Kevin Hartnett|February 2, 2021|Quanta Magazine
And, seating himself beside Dirrik, he began to explain the mysteries of sine, cosine and tangent.Dry Fish and Wet|Anthon Bernhard Elias Nilsen
The sine and the cosine I shall have occasion to employ in the latter part of my lecture.
Like the functions sine and cosine, the elliptic functions have addition theorems, e.g.The New Gresham Encyclopedia|Various
Nevertheless, I bear no grudge against the sine and the cosine, which I continue to hold in high esteem.The Life of the Fly|J. Henri Fabre
The nine cosine-inclinations above are, as has been seen, connected by six equations.