Y add -64.9 div div tan add -0.869 mul 5.19 x_1 add mul 22.900000000000002 pow3 add 0.504 mul 0.9530000000000001 x_4 mul 3.5500000000000003 mul sub mul -4.78 x_2 mul -13.8 x_0 mul x_3 abs add 61.800000000000004 mul -0.47800000000000004 x_3 x_2