Variables
  x1 in [0.25, 1],
  x2 in [1.5, 2*@pi];


Constraints
  0.5*sin(x1*x2) - 0.25*x2/@pi -0.5*x1 = 0,

  (1-0.25/@pi)*(exp(2*x1)-@e) + @e*x2/@pi - 2*@e*x1 = 0;
