Y dfrac 1 4 x 2 x 6 July 8, 2019 16 32 64 128 Frac x^ 4 y^ 6 x^ 2 y^ 2 Y - frac 1 6 x-4 (- 1/2 * x ^ 4 * y) ^ 4 * (16x ^ 4 * y ^ 3) ^ 2
