$$\prod \left(n,\phi ,k\right)=\sin \phi R_F\left({\cos }^2\phi ,1-k^2{\sin }^2\phi ,1\right)+\frac{n}{3}\sin {}^3\phi R_J\left(\cos {}^2\phi ,1-k^2\sin {}^2\phi ,\mathrm{1,1}-n\sin {}^2\phi \right)$$