how can I write Matlab codes for a nonlinear simultaneous equation for a loop function

I am doing a simulation on a four bar linkage mechanism where theta2 is the drive link and I'm to determine theta3 and theta4 from my analysis. I am interested in a 'FOR-LOOP' situation whereby theta2 makes a complete cycle.

clc;
clear all;
syms theta3
syms theta4;

theta2 = 0:pi/18:2*pi;
fgh=solve(2*cos(theta2) + 6 * cos(theta3) - 4 * cos(theta4) -5 == 0,2*sin(theta2) + 6 * sin(theta3) - 4 * sin(theta4) == 0);

fgh.theta3;
fgh.theta4;

k = vpa(fgh.theta3)
j = vpa(fgh.theta4)