Question: what is the difference between law of sines and law of cosines?
Answer: The law of cosines (also called “cosine law”) tells you how to find one side of a triangle if you know the other two sides and the angle between them. The law of sines (i.e. the “sine law”) does not let you do that. ... You could use it, for example if you know two sides and the angles opposite those two sides.