Submit a MATLAB code $(.$m file$)$ named YourlastnameYourfirstnameHW$2$p$2.$m that plots $2$D line plots for the functions ftrue $($in black solid line$)$ versus x in $[5,5]($in the horizontal axis$).$ In the same figure window, plot fapprox$($x$,$ k$)$ for k $=2($in red dashed line$),$ k $=3($in green dashed line$),$ k $=4($in blue dashed line$)$