(1D) Astmid is given by rectangular equation 1:253 + y?\" = 1. In parametric form the curve is given by the equations 3W] 2 cos3 :9 and ytl) = sin'. D E 6' <_: find the poi11t where curve is not smooth. explain your answer. indicate these points on graph. tangent horizontal or an equation of line to when r hm. are length curve. suppose that top part revolved about :raxis. surface area revolution>