I have 3 expressions:
$f(x)=e^{ikx}+Ae^{-ikx}; g(x)= Be^{kx}+Ce^{-kx}; h(x)=De^{ikx}$
I want to find $|A|^2$ by letting
{f'(0)\over f(0)}={g'(0)\over g(0)} and {g'(a)\over g(a)}={h'(a)\over h(a)}
I have done the calculations myself and got $|A|^2=1$. But this is not the expected answer. Could someone tell me if I have made a mistake?
Thanks.