Employ the following methods to find the maximum of the function from Prob. $13\mathrm{.}7$: $($a$)$ Golden$-$section search $($xl $=2,$ xu $=1,\backslash$epsi s $=1\%).($b$)$ Parabolic interpolation $($x$0=2,$ x$1=1,$ x$2=1,$ iterations $=4).$ Select new points sequentially as in the secant method. $($c$)$ Newton$$s method $($x$0=1,\backslash$epsi s $=1\%).$