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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 how to use the cosine rule to find the third side or the angles of a triangle when you know two sides and the angle between them. See examples, formulas, and tips to remember the law of cosines.
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.
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.
Learn what cosine is, how to find its values using right triangles or unit circle, and how to use it in real world problems. See commonly used angles, cosine calculator, and reference angles.
Learn about the cosine function, one of the basic trigonometric functions, and its extension to complex arguments. Find out how to calculate cosine using various formulas, identities, series, products, and integrals.
Mathematically, the cosine function formula in terms of sides of a right-angled triangle is written as: cos x = Adjacent Side/Hypotenuse = Base/Hypotenuse, where x is the acute angle between the base and the hypotenuse. Cosine Graph. As shown in the image above, we note that cos x = OQ/OP = OQ/1 = OQ.
