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- DictionaryCo·sine/ˈkōˌsīn/
noun
- 1. the trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
In mathematics, sine and cosine are trigonometric functions of an angle.
The abbreviation is cos. cos (θ) = adjacent / hypotenuse. Illustrated definition of Cosine: In a right angled triangle, the cosine of an angle is: The length of the adjacent sidebrdivided by the length...
Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same. no matter how big or small the triangle is. To calculate them: Divide the length of one side by another side. Example: What is the sine of 35°?
Jun 7, 2024 · 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 functions are sine [sin], tangent [tan], secant [sec], cosecant [csc], and cotangent [cot].)
Cosine, written as cos (θ), is one of the six fundamental trigonometric functions. Cosine definitions. There are two main ways in which trigonometric functions are typically discussed: in terms of right triangles and in terms of the unit circle.
The common schoolbook definition of the cosine of an angle in a right triangle (which is equivalent to the definition just given) is as the ratio of the lengths of the side of the triangle adjacent to the angle and the hypotenuse, i.e.,
What is cosine? In the context of a right triangle, the cosine function is the ratio of the adjacent side to the hypotenuse. For an angle α, the cosine function is denoted by sin α. In other words, cosine is a trigonometric function of any given angle. The following figure 4-1 represents a typical right triangle.
Sine and cosine — a.k.a., sin (θ) and cos (θ) — are functions revealing the shape of a right triangle. Looking out from a vertex with angle θ, sin (θ) is the ratio of the opposite side to the hypotenuse, while cos (θ) is the ratio of the adjacent side to the hypotenuse.
Introduction to the Cosine Function. Defining the cosine function. The cosine function is one of the oldest mathematical functions. It was first used in ancient Egypt in the book of Ahmes (c. 2000 B.C.).
The cosine is the trigonometric ratio of two adjacent sides, (the base and the hypotenuse) in a triangle that is calculated as the cosine function (or cos function). Out of the three most essential trigonometry functions , cosine is one of them.
