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2*sin(arfa1+arfa2+cta)+2*3^0.5*l2*l3*cos(fai-arfa2-cta)=0
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cta=atan((B+(B^2-A*C)^0.5)/A);
A=m1-m2+(1+m3)*cos(fai);
B=sin(fai);
C=m1+m2+(m3-1)*cos(fai);
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