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  1. Sine and cosine - Wikipedia

    The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side opposite that angle to the length of …

  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 …

  3. Cosine Function in Math - Definition, Formula, Examples

    Feb 4, 2025 · The cosine function (cos) relates an angle of a right triangle to the ratio of the length of the adjacent side (the side next to the angle) to the hypotenuse (the longest side of the …

  4. Cosine | Definition, Formulas, & Facts | Britannica

    cosine, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, is cos A = length of side adjacent to angle A/ length of hypotenuse. (The other five trigonometric …

  5. Cosine - Math.net

    Cosine, written as cos⁡ (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 …

  6. BYJU'S Online learning Programs For K3, K10, K12, NEET, JEE, UPSC ...

    The cosine function (or cos function) in a triangle is the ratio of the adjacent side to that of the hypotenuse. The cosine function is one of the three main primary trigonometric functions and it …

  7. Cosine - Graph, Meaning, Period, Examples | Cosine Function

    The cosine can be defined as the ratio of the length of the base to the length of the hypotenuse in a right-angled triangle. It gives the value of the cosine function for angle x, denoted by cos x.

  8. Cosine Function (Cos) - GeeksforGeeks

    Oct 1, 2024 · The cosine function is a trigonometric function defined as the ratio of the adjacent side to the hypotenuse. Explore its graph, formula, properties, and examples.

  9. 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 …

  10. Cosine - math word definition - Math Open Reference

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