Testing the MathJax latex plugin:

\kappa = \sqrt{4-\cos(\theta)}

Testing the MathJax latex plugin:

\kappa = \sqrt{4-\cos(\theta)}

I think it works rather well: I_\nu(s)=I_\nu(s_0)e^{-\tau_\nu(s_0,s)}+\int_{s_0}^{s}j_\nu(s')e^{-\tau_\nu(s',s)}ds'