4. The parametric curves dened by t{t) = (cost,smt, t) and qt} = (14,1 u, g) intersect at a point P. (a) Find P. (b) Let B be the angle between 113} and q(u) at P. Find me 9. (c) Find an equation for the plane that contains the point P and is parallel to both of the tangent lines to r(t) and q{u} at P