9x 4y 2 1 July 8, 2019 16 32 64 128 9x 2 4y 2 12xy 9x 2 4y 2 18x 16y 43 0 9x 2 4y 2 18x 8y 23 0 9x 2 4y 2 36x 16y 16 0 3x 4y )( 9x 2 16y 2 12xy 9x 2 6x 4y 2 1 9x 2 4y 2 4y 12x 5 0 9x 4 12x 2y 4y 2 9x 2 4y 2 18x 16y 11 0 9x 2 4y 2 12xy 2023 9x 2 4y 2 18x 24y 9 0 9x 2 4y 2 144 9x 2 4y 2 18x 16y 11 9x 4y 2 3x y 10 Dy dx =( 9x 4y 1 2
