Model hs75 Parameters a = 0.48 l[1] = 0 l[2] = 0 l[3] = -a l[4] = -a u[1] = 1200 u[2] = 1200 u[3] = a u[4] = a End Parameters Variables x[1:4] = 0, >=l[1:4], <=u[1:4] obj End Variables Equations -a <= x[4] - x[3] <= a x[1] = 1000*sin(-x[3] - 0.25) + 1000*sin(-x[4] - 0.25) + 894.8 x[2] = 1000*sin(x[3] - 0.25) + 1000*sin(x[3]-x[4] - 0.25) + 894.8 1000*sin(x[4] - 0.25) + 1000*sin(x[4] - x[3] - 0.25) + 1294.8 = 0 ! best known objective = 5174.4129 obj = 3*x[1] + 1.0e-6*x[1]^3 + 2*x[2] + 2.0e-6*x[2]^3/3 End Equations End Model