Chapter 10.1, Problem 18E

(a)

To determine

To obtain: The equation in terms of x and y by eliminating the parameter t in the parametric equation $x=1-{\sin }^{2}s,y=\cos s;\pi \le s\le 2\pi$.

(b)

To determine

To describe: The curve whose parametric equation is defined as, $x=1-{\sin }^{2}s,y=\cos s;\pi \le s\le 2\pi$.