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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.
Learn how to calculate sine, cosine and tangent of any angle using a right triangle. See examples, graphs, animations and exercises on these trigonometric functions.
Learn what cosine is, how to find its values using right triangles or unit circle, and how to use a calculator or a table. See commonly used angles and their cosine values, and how to use reference angles to extend the domain of cosine.
Funkcja cosinus. Funkcja cosinus jest określona w trójkącie prostokątnym jako stosunek przyprostokątnej przyległej i przeciwprostokątnej. Funkcja jest definiowana od −∞ do +∞ i przyjmuje wartości od −1 do 1. A B C a b c α β. cos α = b c cos β = a c.
Learn about the cosine function, one of the basic trigonometric functions, and its extension to complex arguments. Find out how to calculate cosine using sums, products, exponentials, and Fourier transforms, and explore its identities and integrals.
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'.
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.).
