Trigonometry (10th Edition)

-5280 $^{\circ}$ is a big negative number compared to 360. The best way to find its coterminal angle is to divide initial angle 360 and find how many times 360 should be added. However, this time we should round favoring larger negative full number. -5280° ÷360° = -14 $\frac{2}{3}$ -5280° +15×360° = 120°