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wikipedia.org
https://en.wikipedia.org/wiki/Sine_and_cosine
Sine and cosine - Wikipedia
In mathematics, sine and cosine are trigonometric functions of an angle.
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mathsisfun.com
https://www.mathsisfun.com/sine-cosine-tangent.htm…
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.
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sciencenotes.org
https://sciencenotes.org/cosine-function-in-math-d…
Cosine Function in Math - Definition, Formula, Examples
Learn about the cosine function in math. Get its definition, formula, and examples in trigonometry, geometry, and calculus.
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britannica.com
https://www.britannica.com/science/cosine
Cosine | Definition, Formulas, & Facts | Britannica
The cosine is a fundamental trigonometric function such that the cosine of an angle of a right triangle is the ratio of its adjacent side to the hypotenuse.
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math.net
https://www.math.net/cosine
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 and in terms of the unit circle.
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azcalculator.com
https://www.azcalculator.com/calculators/trigonome…
Trigonometric Functions Calculator - Sine, Cosine, Tangent & More ...
Easily calculate sine, cosine, tangent, cosecant, secant, and cotangent values for any angle in degrees or radians with our free online trigonometric functions calculator.
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algebrica.org
https://algebrica.org/sine-and-cosine/
Sine and Cosine | Algebrica
Sine and cosine, denoted as sin (θ) and cos (θ), are fundamental trigonometric functions that associate each angle, defined from the unit circle, with a value between -1 and +1.
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mathopenref.com
https://www.mathopenref.com/cosine.html
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) divided by the length of the hypotenuse (H). In a formula, it is written simply as 'cos'.
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rapidtables.com
https://www.rapidtables.com/math/trigonometry/cos.…
cos (x) | cosine function - RapidTables.com
Cosine definition In a right triangle ABC the cosine of α, cos (α) is defined as the ratio betwween the side adjacent to angle α and the side opposite to the right angle (hypotenuse):
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mathwarehouse.com
https://www.mathwarehouse.com/trigonometry/sine-co…
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 practice problems on identifying the sides that are opposite and adjacent to a given angle.