Question

Find the intervals on which the epicycloid C given by \[\text{r(t)=5*(cos t - cos 5t)i+(5 sin t - sin 5t)j}, 0\leq t\leq2\pi\] is smooth.

Answer 1

interval is not visible

Answer 2

what've you written 0<=t<=?

Answer 3

No that's how it probably looks like on your computer, or how you see it. The interval is 0<=t<=2pi