C

n=sqrt(5.7975+0.2311/(pow(x,2)-0.0688)-0.00257*pow(x,2))

Python

n=(5.7975+0.2311/(x**2-0.0688)-0.00257*x**2)**.5

Fortran

n=SQRT(5.7975+0.2311/(x**2-0.0688)-0.00257*x**2)

MATLAB

n=sqrt(5.7975+0.2311./(x.^2-0.0688)-0.00257.*x.^2)

LaTeX

n^2=5.7975+\frac{0.2311}{λ^2-0.0688}-0.00257λ^{2}