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  1. 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 …

  2. Sine and cosine - Wikipedia

    In mathematics, sine and cosine are trigonometric functions of an angle.

  3. Cosine Function (Cos) - GeeksforGeeks

    Jul 23, 2025 · 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 …

  4. Cosine Function in Math – Definition, Formula, Examples

    Feb 4, 2025 · Learn about the cosine function in math. Get its definition, formula, and examples in trigonometry, geometry, and calculus.

  5. 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.

  6. Cosine - Graph, Meaning, Period, Examples | Cosine Function

    Cosine is one of the important trigonometric ratios. The cosine function is simply denoted as cos x. It is the ratio of base and hypotenus.

  7. Sine and Cosine - Algebrica

    4 days ago · 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.

  8. 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) …

  9. What is cosine? - gauthmath.com

    Cosine is a fundamental trigonometric function that relates an angle in a right triangle to the ratio of the adjacent side to the hypotenuse. It plays a crucial role in various fields, including …

  10. Cosine: Definition - Math.com

    Given an angle q, the cos (q) can be defined as the x-coordinate of the point on the circle that is located at an angle q from the origin. (According to standard convention, angles are measured …