Sine and Cosine rule are both used in solving trigonometry problems.Give an example of when the cosine rule is more appliciable than the sine rule?

Answer 1

if you know two sides and the included angle, the law of cosines will give you the other side.

if you know two sides and the angle opposite one of them, the law of sines will other opposite angle. Or if you know the angles and one side, you can get the other sides.