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  1. Trigonometric functions - Wikipedia

  2. Cosine -- from Wolfram MathWorld

    WEBThe 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 โ€ฆ

  3. Sine, Cosine, Tangent - Math is Fun

    WEBLearn how to calculate sine, cosine and tangent of any angle using a right triangle. See examples, graphs, animations and exercises on these trigonometric functions.

  4. Cosine - Math.net

    WEBLearn 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 โ€ฆ

  5. Law of cosines - Wikipedia

  6. Cosine: Introduction to the Cosine Function - Wolfram

    WEBSums of two direct functions. The sum of two cosine functions can be described by the rule: "the sum of the cosines is equal to two times the cosine of the halfโ€difference multiplied by the cosine of the halfโ€sum." A โ€ฆ

  7. The Law of Cosines - Math is Fun

    WEBLearn 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.

  8. Sine and Cosine Rules - An Introduction

    WEBCosine Rule (The Law of Cosine) The Cosine Rule is used in the following cases: 1. Given two sides and an included angle (SAS) 2. Given three sides (SSS) The Cosine Rule states that the square of the length of any side โ€ฆ

  9. Cosine function โ€” online calculator, formulas, graph