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In trigonometry, the Cosine Rule says that the square of the length of any side of a given triangle is equal to the sum of the squares of the length of the other sides minus twice the product of the other two sides multiplied by the cosine of angle included between them. Cosine rule is also called law of cosines or Cosine Formula . Suppose, a, b and c are lengths of the side of a triangle ABC, then; Law of Cosines Definition In Trigonometry, the law of Cosines , also known as Cosine Rule or Cosine Formula basically relates the length of the triangle to the cosines of one of its angles. It states that, if the length of two sides and the angle between them is known for a triangle, then we can determine the length of the third side. It is ... Learn the cosine rule ( law of cosines) with simple formulas, step-by-step examples, and clear explanations for solving triangles. Includes angle, side, proof, and real-life applications. The cosine rule , also known as the law of cosines, relates all 3 sides of a triangle with an angle of a triangle. It is most useful for solving for missing information in a triangle. For example, if all three sides of the triangle are known, the cosine rule allows one to find any of the angle measures. Similarly, if two sides and the angle between them is known, the cosine rule allows …
