Posted by **Catherine** on Thursday, April 14, 2011 at 9:51pm.

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions.

(a) When is the parameterization tracing the circle out in a clockwise direction?

_____________

(Give your answer as a comma-separated list of intervals, for example, (0,1), (3,Inf)). Enter the word None if there are no such intervals.

(b) When is the parameterization tracing the circle out in a counter-clockwise direction?

__________

(Give your answer as a comma-separated list of intervals, for example, (0,1), (3,Inf)). Enter the word None if there are no such intervals.

C)Does the entire unit circle get traced by this parameterization?

(d) Give a time t at which the point being traced out on the circle is at (10):

t=_________

Ok, I graphed it in my graphing calculator, the circle seemed to be tracing itself for a while, but I still don't get how to write the intervals. Since it appeared to be just tracing itself clockwise, I typed in the first one (my homework is online)

(0,1),(1,0),(0,-1),(-1,0)

A message was shown saying that the left endpoint must be less than the right endpoint, so I'm not sure how to solve this one. I believe the answer for B is none, and I don't know what to put for the time, please explain this to me....

- Calculus (please help!!!) -
**Catherine**, Thursday, April 14, 2011 at 9:55pm
I typed 0 for the time, since it was at (0,1) when it started, and slected yes for part c, I have part A and B wrong, I don't know how to write the intervals from part A and I didn't see any counter-clockwise motion... please explain...

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