For Class B or C stability, the exponents in Eqs. $(20\mathrm{.}3)$ and $(20\mathrm{.}4)$ are nearly unity. For these two stability classes, assume that sigma$\_\{$y$\}=$ alpha$*$x and sigma$\_\{2\}=$ cx where and are the constants from Table $20\mathrm{.}2$ Derive expressions for $($Cu$/$Q$)$ Dax and x max from E$\_\{9\}.(20\mathrm{.}1).$ Hint: Set y $=0$ substitute the above expressions for sigma$\_\{$y$\}$ and sigma$\_\{$z$\}$ into Eq$(20\mathrm{.}1),$ then differentiate with respect to x and set dx $=0$ to find x max in terms of H$.$ Back substitute to find $($cw$)$ Q$)$ max in terms of a$,$ c $,$ and H$.$