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theta1 = linspace(-3*pi/4,3*pi/4,100);
theta2 = linspace(-2*pi/3,2*pi/3,100);
x = 400*cos(theta1) + 250*cos(theta1+theta2);
y = 400*sin(theta1) + 250*sin(theta1+theta2);
plot(x,y)
hold on;
theta1 = linspace(-pi,pi,100);
theta2 = ones(1,100)*pi;
x = 400*cos(theta1) + 250*cos(theta1+theta2);
y = 400*sin(theta1) + 250*sin(theta1+theta2);
plot(x,y)
axis equal
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