2x 3y 8 x y July 8, 2019 16 32 64 128 2x 3y 8 x y 1 2x 3y 8 x y 5 2x 3y 8 x y 9 2x 3y 8 x y 3 2x 3y 8 x y 2 2x 3y 8 x y 4 2x 3y 6 x y 8 6x 2x 4 y 3y 8 x X y 2x 3y 8 19 2x 3y 8 x y xy 7 3 2x 3y 8 dx =( x y 3 dy 2x 3y 8 0 x y 1 0 2x 3y 8 x y )/( x y 7 3 2x 3y =- xy 8 x 6 y 5