1. The problem statement, all variables and given/known data Describe motion of a particle w/ position xy 2. Relevant equations x=cospi(t) y=sinpi(t) 3. The attempt at a solution solving for t t=x/cospi so y=sinpi(x)/cospi y=tanpi(x) interval=at least one at most 2 since tan(x)=0 at pi and 2pi and this is where the boundaries are so the particle travels from pi and 2pi counterclockwise but the textbook has a different (but reasonable) answer in that it squares cos pi and sin pi to equal 1 and uses the circle equation but ends up with the same diagram and direction. If I went wrong, can you please tell me where I went wrong since my answer seems legit to me.