Law of Cosines - Trigonometry

In this video we solve for lengths and angles of triangles which require the law of cosines. These triangles are in the form SSS or SAS.

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NOTE: in problem # 2: there is a calculation mistake.

225 = 628 - 528cosC
-403 = - 528cosC

however, due to complete luck the final answer is still 30 degrees.