Like the functions sine and cosine, the elliptic functions have addition theorems, e.g.
And, seating himself beside Dirrik, he began to explain the mysteries of sine, cosine and tangent.
These are then respectively the sine and cosine of the angle α between the radius and one of the axes (O X).
Multiply this by the cosine of the angle and divide by the sine, and we shall get the value of the arc QY for the equator.
Nevertheless, I bear no grudge against the sine and the cosine, which I continue to hold in high esteem.
The sine and the cosine I shall have occasion to employ in the latter part of my lecture.
Here then was the sine of an arc which did not recognize equality in the cosine of its supplement.
Integrators were of three kinds: radius machines; cosine machines; tangent machines.
1630s, from co. sinus, abbreviation of Medieval Latin complementi sinus (see complement + sine).