$3\mathrm{.}18$ Develop a function function M$-$file that returns the

difference between the passed function's maximum and

minimum value given a range of the independent variable.

In addition, have the function generate a plot of the function

for the range. Test it for the following cases:

$($a$)f(t)=8e^{-0\mathrm{.}25t}sin(t-2)$ from $t=0$ to $6.$