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  1. Sine and cosine - Wikipedia

    In mathematics, sine and cosine are trigonometric functions of an angle.

  2. 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 …

  3. 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 …

  4. 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.

  5. Sine Function in Math - Definition, Formula, Examples

    Feb 18, 2025 · The sine function, commonly written as sin (θ), is the ratio of the opposite side to the hypotenuse of a right triangle. It is one of the primary trigonometric functions used in mathematics.

  6. Sine -- from Wolfram MathWorld

    The sine function sinx is one of the basic functions encountered in trigonometry (the others being the cosecant, cosine, cotangent, secant, and tangent). Let theta be an angle measured counterclockwise …

  7. The sine function - math word definition - Math Open Reference

    The sine function, along with cosine and tangent, is one of the three most common trigonometric functions. In any right triangle, the sine of an angle x is the length of the opposite side (O) divided by …