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//Force developed in member DF
//refer fig. 8.23
//Applying virtual work principle
//-100*10*delta(theta)-100*5*delta(theta)+FDF*5*delta(theta)*cosd(45)=0
FDF=1500/(5*cosd(45)) //kN (tensile)
printf("Thus force developed in member DF is FDF=%.2f kN (Tensile)",FDF)
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