Y add 65.9 div pow2 add 0.057 mul -2.77 x_1 sub mul -1.49 div mul sqrt add 8.120000000000001 mul -0.058 x_2 pow2 add 3.43 mul 96.7 div x_1 div x_1 pow3 add 0.356 mul 0.47900000000000004 x_1 x_2 mul -28.3 x_0