What is the projection of vector u=(2,3,1)u = (2, 3, 1)u=(2,3,1) onto the xyxyxy-plane?
(2,3,0)(2, 3, 0)(2,3,0)
(0,0,1)(0, 0, 1)(0,0,1)
(2,0,1)(2, 0, 1)(2,0,1)
(0,3,0)(0, 3, 0)(0,3,0)