plot y=1+0.05792105/(238.0185-x^-2)+0.00167917/(57.362-x^-2); y=sqrt(1+4.334446e-4 x^2/(x^2-3.470339e-3)+1.118728e-4 x^2/(x^2-1.394001e-2)); x=0.2 to 1.7