2) Find the equation of the plane which passes through the points ( Y , D , - 1 ) , ( 0, 2, 3 ) and (0, 0,5 ) in R 3 ) Consider the set : R = 3 (r,0 )| 26 6 6 3, #101 24 1 3 Draw R in the plane (r, D), describe R in cartesian coordinates x=r cost, yoursino, and Araw R in the (x, y ) plane. H) Describe the surface z = x2 + yz in Cylindrical coordinates ( simplify its expression if possible . ) 5 ) Describe the two - sheet cone Z"= x ty in spherical coordinates (simplify its expression if possible.) 6 ) Let A and B be two open bubsots of In" Show that their intersection AnB is also on open set