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solve 7*F-F1-6*F2*sin(pi/3)=0, F2=F1*exp(0.33*5*pi/6), F=17 for F1, F2
solve 7*F-F1-6*F2*sin(pi/3)=0, F2=F1*exp(0.33*5*pi/6), F=17 for F1, F2
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