$2\mathrm{.}12$: Express the shear force $V(x)$ and moment $M(x)$ within the span $AC$ as a function

of $x$ for the beams shown in Figs. $(2$P$\mathrm{.}12$a$-$b$)$ and sketch the variation with $x.$

$($a$)$

$($b$)$