用matlab在极坐标下绘制一个正方形,设边长为x,任意顶点坐标为(a,b...答:;polar(theta,r)function [r,theta] = rc(theta1,theta2,rj,N)dtheta = (theta2-theta1)/N;theta = theta1:dtheta:theta2;r = rj*csc(theta);function [r,theta] = rr(theta1,theta2,rj,N)dtheta = (theta2-theta1)/N;theta = theta1:dtheta:theta2;r = rj*sec(theta);...