Sine, Cosine and Tangent - Math is Fun
Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: To calculate them: Divide the length of one side by another side. Example: What is the sine of 35°? Using this triangle (lengths are only to one decimal place): = …
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 that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that of the hypotenuse.
Cosine Function (Cos) - Definition, Formula, Table, Graph, Questions
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 is itself the complement of sine (co+sine). There are various topics that …
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 functions are sine [sin], tangent [tan], secant [sec], cosecant [csc], and cotangent [cot].)
Cosine -- from Wolfram MathWorld
The cosine function is one of the basic functions encountered in trigonometry (the others being the cosecant, cotangent, secant, sine, and tangent). Let be an angle measured counterclockwise from the x -axis along the arc of the unit circle. Then is …
Trigonometric functions - Wikipedia
In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [ 1 ] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.
Law of cosines - Wikipedia
In trigonometry, the law of cosines (also known as the cosine formula or cosine rule) relates the lengths of the sides of a triangle to the cosine of one of its angles. For a triangle with sides and opposite respective angles and (see Fig. 1), the law of cosines states:
Cosine Rule (Laws of Cosine, Formula, Examples and Proof) - BYJU'S
Cosine rule is also called law of cosines or Cosine Formula. Suppose, a, b and c are lengths of the side of a triangle ABC, then; where ∠x, ∠y and ∠z are the angles between the sides of the triangle. The cosine rule relates to the lengths of the sides of a …
Cosine - Graph, Meaning, Period, Examples | Cosine Function
Cosine is one of the primary mathematical trigonometric ratios. The ratio of the lengths of the side adjacent to the angle and the hypotenuse of a right-angled triangle is called the cosine function which varies as the angle varies. It is defined in the context of …
Cosine Formula - What Are Cosine Formulas? Examples - Cuemath
The cosine formulas are formulas of the cosine function in trigonometry. The cosine function (which is usually referred to as "cos") is one of the 6 trigonometric functions which is the ratio of the adjacent side to the hypotenuse.