Cos 2x = 1 - Math Central
We have two responses for you. Hi Christina, I drew a rough sketch of y = cos t for 0 ≤ t ≤ 360 degrees. You can see from the graph that cos t = 1 if t = 0 or t = 360. You also know from the periodic nature of the cosine function that cos t = 1 if t = 0, ...