The law of cosines formula is a fundamental equation in trigonometry that relates the lengths of the sides of a triangle to the cosine of one of its angles. This formula is essential for solving triangles when given two sides and the included angle, or all three sides, and is particularly useful in non-right triangles. It serves as a generalization of the Pythagorean theorem, allowing for calculations involving any type of triangle.
congrats on reading the definition of law of cosines formula. now let's actually learn it.