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The above figure serves as a reference for quickly determining the cosines (x-value) and sines (y-value) of angles that are commonly used in trigonometry. As can be seen from the figure, cosine has a value of 0 at 90° and a value of 1 at 0°. Sine follows the opposite pattern; this is because sine and cosine are cofunctions (described later).1) Use Law of Cosines to find the side opposite of the given angle 2) Use Law of Sines to find the acute angle opposite of the shorter side (definitely less than 90*, no ambiguous case) 3) Triangle Sum Theorem (A + B + C = 180*)