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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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wolfram.com
https://mathworld.wolfram.com/Cosine.html
Cosine -- from Wolfram MathWorld
The cosine function cosx is one of the basic functions encountered in trigonometry (the others being the cosecant, cotangent, secant, sine, and tangent). Let theta be an angle measured counterclockwise from the x-axis along the arc of the unit circle.
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geeksforgeeks.org
https://www.geeksforgeeks.org/maths/cosine-functio…
Cosine Function (Cos) - GeeksforGeeks
The cosine function (cos) is one of the fundamental trigonometric functions used in mathematics, primarily in the study of angles and triangles. In simple terms, the cosine of an angle in a right-angled triangle is the ratio of the length of the adjacent side to the length of the hypotenuse.
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unl.edu
https://mathbooks.unl.edu/PreCalculus/sine-and-cos…
The Sine and Cosine Functions - University of Nebraska–Lincoln
The special values of sine and cosine in the first quadrant are very useful to know, since knowing them allows you to quickly evaluate the sine and cosine of common angles without needing to look at a reference sheet or use your calculator.
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cuemath.com
https://www.cuemath.com/cosine-formulas/
Cosine Formula - What Are Cosine Formulas? Examples - Cuemath
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. There are multiple formulas related to cosine function which can be derived from various trigonometric identities and formulas.
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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.
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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):