4) Consider the curve C in the (x,y)-p|ane defined by the set of parametric equations :r;(t) : cos(t) + 2 y(t) : 331n(t) (303(1) + 3, 0 S t g 2w a) (8 points) Show that the curve has two tangent lines at the point (2,3) and then find the equations of the two tangent lines to the curve at this point. b) (6 points) Find all points (my) on C where there is a vertical tangent line