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 function such that $$ can

be a vector.

a$)$ Use the function to calculate $r(\frac{}{6})$ and $r(2\frac{}{3}).$

b$)$ Use the function to plot $($polar plot$)r()$ for $02.$ Hint: use "help polar" and$/$or google

for "polar plot in matlab." Include the title $"$ theta