Using law of cosines to find our missing length of a triangle

The video tutorial explains how to solve a triangle problem using the law of cosines. It begins by introducing the problem and the given values of the triangle. The instructor then discusses the decision-making process between using the law of sines or cosines, ultimately choosing the latter due to the available information. The tutorial proceeds with a step-by-step application of the law of cosines, including detailed calculations, to find the length of side a. The video concludes with the final result of the calculation.

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