Mary Christmas :)!!!!!
Law of sine is used when given at least 2 sides and one angle, or given 2 angles and one side. Law of cosine is used when given three sides, or three angles, or one angle and two sides. When we solve a problem, we better just use law of cosine one. And continue the problem using law of sines. Because the law of cosine is more complicated than law of sine, we can avoid unassary calculation errors by choosing a simpler method. Law of sines is that the fraction of one side and it's opposite angle is proportional to the other set of angle and side. Law of cosine is a^2=b^2+c^2-2bc CosA. And same for solving other sides.
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