1. Set 0 to 0', so the blue point is at (1, 0). (To quickly set e to a specific value, type the value in the text box, and hit (cos(@), sin(e)) Enter.) Then drag the point counterclockwise around the 1 circle once. y X A. When is cos(0) positive? X B. When is cos(0) negative? C. Explain why that makes sense, based on the unit circle