X 2 y 2 3y 4 0 July 8, 2019 16 32 64 128 X 2 2y 2 2xy 3y 4 0 X 2 2y 2 3xy 2x 3y 4 0 X 2 y 2 z 2 xy 3y 2z 4 0 X 2 4 dy y 2 3y dx 0
