$9)$ Find the area under the curve f$($x$)=1\backslash$pi e$$x$2$

from x $=0$ to x $=20$ using $10$

rectangles $($rectangular method$).$ You MUST provide the command for a script OR

function file that helps you do this. Modify the following from your lab to help you:

$($you$$re welcome$)$

a$=0$; b $=$ pi$/2$; n $=250$;

delta $=($b$-$a$)/$n;

i $=1$:n;

x $=$ a $+$ i$*$delta;

sum$($sin$($x$)*$ delta$)$