Multiple choice general knowledge cos 0= 0 -1 1 -1/2 Reveal answer Fill a bubble to check yourself C Correct answer Explanation cos 0° = 1 because at angle 0 on the unit circle, the point is (1, 0), and cosine represents the x-coordinate. This is a fundamental value in trigonometry. Options 0, -1, and -1/2 are incorrect.