Use matlab

2) #2/p.248 2. Write a user-defined MATLAB function for the following math function: r(0) 4cos(4sine) 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(n/6) and (5m/6). (b) Use the function to plot (polar plot) r(e) for 0 $8s2r