4) Consider the curve C in the (x, yjplane defined by the set of parametric equations dz) = cos\") + 2 gm = 3sin(t]cos[) + 3, 0 g t g 211' a] (3 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 (1,3,0 on C where there is a vertical tangent line