Solution (source code)

= Solution

For fixed $V_0$ and $a$, $0\leq\sin^2(\alpha a)\leq1$ while the multiplier of this bounded factor tends to zero as $E^{-2}$. Consequently \b[$\boxed{\lim_{E\to\infty}P(E)=1}$], even though the sine factor itself does not have a limit. This is the high-energy classical transmission limit.