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>> syms \alpha x y z R r l m \theta_1 \theta_2 \theta_3 \theta_4
eq1=[2^1/2*r*sin(\pi/4-\alpha)*cos\alpha+x-R-l*sin\theta_1]^2+[2^1/2*r*sin(\pi/4-\alpha)*sin\alpha+y]^2+(z+l*cos\theta_1)^2-m^2;
eq2=[-2^1/2*r*cos(\pi/4-\alpha)*sin\alpha+x]^2+[2^1/2*r*cos(\pi/4-\alpha)*cos\alpha+y-R-l*sin\theta_2]^2+(z+l*cos\theta_2)^2-m^2;
eq3=[-2^1/2*r*sin(\pi/4-\alpha)*cos\alpha+x+R+l*sin\theta_3]^2+[-2^1/2*r*sin(\pi/4-\alpha)*sin\alpha+y]^2+(z+l*cos\theta_3)^2-m^2;
eq4=[2^1/2*r*cos(\pi/4-\alpha)*sin\alpha+x]^2+[-2^1/2*r*cos(\pi/4-\alpha)*cos\alpha+y+R+l*sin\theta_4]^2+(z+l*cos\theta_4)^2-m^2;
d=solve(eq1,eq2,eq3,eq4)
d.\theta_1 \theta_2 \theta_3 \theta_4
??? Error using ==> syms at 61
Not a valid variable name.
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