QUESTION $7$:

Solve in Matlab. Write a local function called cosLineWidths that will plot $cos(x)$ for $x$ values ranging from pi to pi in steps of $0\mathrm{.}1,$ using black $*\text{'}$s$.$ It will do this three times across in one Figure Window, with varying line widths $($Note: even if individual points are plotted rather than a solid line, the line width property will change the size of these points.$).$ If no arguments are passed to the function, the line widths will be $1,2,$ and $3.$ If$,$ on the other hand, an argument is passed to the function, it is a multiplier for these values $($e$.$g$.,$ if $3$ is passed, the line widths will be $3,6,$ and $9).$ The line widths will be printed in the titles on the plots.

Test your function with:

cosLineWidths

cosLineWidths $(0\mathrm{.}5)$