eliminate the parameter in the parametric equations x$=4+$ sin t$,$ y$=5+2$ sin t$,$ for $0$ less than or equal to t less than or equal to pi$/2$ and describe the curve indicating its positive orientation, how does this curve differ from the curve x $=4+$ sin t$,$ y $=5+2$ sin t$,$ for pi$/2$ less than or equal to t less than or equal to pi