I need MatLab code, show all steps. Will thumbs up$.$

Write a user$-$defined MATLAB function for the following math function:

$r()=4cos(4sin)$

The input to the function is $($in radians$)$ and the output is $r.$ Write the func$-$

tion such that $$ can be a vector.

$($a$)$ Use the function to calculate $r(\frac{}{6})$ and $r(5\frac{}{6}).$

$($b$)$ Use the function to plot $($polar plot$)r()$ for $02.$