Making $2-$D plots. Write a separate m$-$file for each part. Remember to print each plot to its separate PNG file and additionally write a text file with comments for the whole problem to explain briefly how you solved the problem.

$($a$)$ Plot each of the following functions over each specified domain. f $($x$)=2$ sin$($x$)+$ cos$($x$),$ x in $[2\backslash$pi $,2\backslash$pi $]$

g$($x$)=$ ex cos$($x$),$ x in $[0,2\backslash$pi $]$ h$($x$)=1/(1+$x$^2),$ x in $[5,5]$