The Law of Cosines is a fundamental formula used in trigonometry that relates the lengths of the sides of a triangle to the cosine of one of its angles. This formula is especially useful for solving triangles that are not right triangles, allowing the calculation of unknown side lengths or angle measures based on known values. It serves as a crucial tool for connecting side lengths and angles in various types of triangles, expanding the application of trigonometric principles beyond just right triangles.
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