C

n=sqrt(1+0.6961663/(1-pow(0.0684043/x,2))+0.4079426/(1-pow(0.1162414/x,2))+0.8974794/(1-pow(9.896161/x,2)))

Python

n=(1+0.6961663/(1-(0.0684043/x)**2)+0.4079426/(1-(0.1162414/x)**2)+0.8974794/(1-(9.896161/x)**2))**.5

Fortran

n=SQRT(1+0.6961663/(1-(0.0684043/x)**2)+0.4079426/(1-(0.1162414/x)**2)+0.8974794/(1-(9.896161/x)**2))

MATLAB

n=sqrt(1+0.6961663./(1-(0.0684043./x).^2)+0.4079426./(1-(0.1162414./x).^2)+0.8974794./(1-(9.896161./x).^2))

LaTeX

n^2-1=\frac{0.6961663λ^2}{λ^2-0.0684043^2}+\frac{0.4079426λ^2}{λ^2-0.1162414^2}+\frac{0.8974794λ^2}{λ^2-9.896161^2}