$$\begin{array}{llll}\hfill K_{\mu }& =\sum _{k=0}^{\infty }{c}_k{f}_k& \hfill & \\ \hfill K_{\mu +1}& =\frac{2}{x}\sum _{k=0}^{\infty }{c}_k{h}_k& \hfill & \end{array}$$