[tex]\frac{[(e-m)^2-(e+m)^2].[(y-1)^2-(y+1)^2]}{a.16.n.h}.\frac{e}{u^{-1}}[/tex]
[tex]\frac{\left ( e-m-e-m \right )\left ( e+m+e+m \right )\left ( y-1-y-1 \right )\left ( y-1+y+1 \right )}{a.16.n.h}.\frac{e}{u^{-1}}[/tex]
[tex]=\frac{-2m.2e.2y.\left ( -2 \right )}{16a.n.h}.\frac{e}{u^{-1}}[/tex]
[tex]=\frac{16y.e.m}{16a.n.h}.\frac{e}{\frac{1}{u}}[/tex]
[tex]=\frac{y.e.m}{a.n.h}.e.u[/tex]
[tex]=\frac{e^{2}y.m.u}{a.n.h}[/tex]