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Learn how to calculate sine, cosine and tangent of any angle using a right triangle. See examples, animations, graphs and exercises to practice the functions.
Learn how to calculate cosine using right triangles, unit circle, and a calculator. Find the cosine values of commonly used angles and reference angles, and see how cosine relates to sine and other trigonometric functions.
Learn how to calculate cosine using various formulas derived from trigonometric identities and laws. Find the cosine of different angles, sides and angles in a triangle with examples and FAQs.
Learn what is cosine and how to calculate it for any angle in degrees or radians. Use this online tool to find the cosine value instantly and explore its properties, graph and table.
Learn how to use the Law of Cosines 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 and apply this trigonometry rule.
Use this online tool to find the cosine of an angle in degrees or radians. Learn the definition, formula, and applications of the cosine function in trigonometry and physics.
Learn how to use sine, cosine and tangent functions to find angles and distances in right-angled triangles. Explore the unit circle, degrees and radians, and how to solve triangles with trigonometry.