Do not use any built in MATLAB functions or operators that calculate values that are being found automatically, and please follow commented instructions thoroughly. Thank you

\%Return theta, the angle (in radians) between vectors x and y. \%use the arcos functions and other functions in this lab \%to implement this function. \%Do not use any built in functions or operators that calculate \%theta automatically. function [ theta] = angle (x,y) end \%Return d the value in degrees of r radians. \%use Matlab's pi for this function. function [d]= radiantodegree (r) end \%Return 1 for p if vectors x and y are perpendicular. \%otherwise, return for p if vectors x and y are NOT perpendicular. \%Use an epsilon threshold of 223 for this function. function [p]= isperpendicular (x,y) end \%Return 1 for p if vectors x and y are parallel. \%otherwise, return 0 for p if vectors x and y are NoT parallel. \%Use an epsilon threshold of 223 for this function. function [p]= isparallel (x,y) end