Sine and cosine - Wikipedia
In mathematics, sine and cosine are trigonometric functions.

Sine, Cosine and Tangent - Math is Fun
Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Before getting stuck into the functions, it helps to give a name to each side of a right triangle: Opposite is always opposite the angle. And Adjacent is always next to the angle.

SINE Definition & Meaning - Merriam-Webster
The meaning of SINE is the trigonometric function that for an acute angle is the ratio between the leg opposite the angle when it is considered part of a right triangle and the hypotenuse.

Sine | Definition, Formulas, & Facts | Britannica
sine, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, is sin A = length of side opposite angle A/ length of hypotenuse. (The other five trigonometric functions are cosine [cos], tangent [tan], secant [sec], cosecant [csc], and cotangent [cot].)

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Trigonometric functions - Wikipedia
The sine and cosine functions are one-dimensional projections of uniform circular motion. Trigonometric functions also prove to be useful in the study of general periodic functions.

Sine, Cosine, Tangent, explained and with Examples and practice ...
This page explains the sine, cosine, tangent ratio, gives on an overview of their range of values and provides many practice problems on identifying the sides that are opposite and adjacent to a given angle.

Sine -- from Wolfram MathWorld
Sine is an entire function and is implemented in the Wolfram Language as Sin [z]. A related function known as the hyperbolic sine is similarly defined, The sine function can be defined analytically by the infinite sum. It is also given by the imaginary part of the complex exponential.

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Sine - Math.net
Sine, written as sin⁡ (θ), is one of the six fundamental trigonometric functions. There are two main ways in which trigonometric functions are typically discussed: in terms of right triangles and in terms of the unit circle.