function [ z ] = ex8_1_3( x1, x2 )
% Evaluates ex8_1_3 from the COCOS Lib2 set

z = (1 + (1 + x1 + x2).^2.*(19 + 3*x1.^2 - 14*x1 + 6*x1.*x2 - 14.*x2 + 3*...
              x2.^2)).*(30 + (2*x1 - 3*x2).^2.*(18 + 12*x1.^2 - 32*x1... 
              - 36*x1.*x2 + 48.*x2 + 27*x2.^2));


end

