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//
o=45.0*3.14/180.0 //angle of inclination
u=0.5 //coefficient of friction
r=1.5 //ratio of mans weight to ladders weight
o1=45.0*%pi/180.0 //angle of inclination
//from law of friction
//Fa = μNa
//Fb = μNb
//Fa – Nb = 0
//Na + Fb = W + r W
//ΣMA = 0
o=(((u*u+u)*(1+r)/((1+u)))-1.0/2.0)/r
printf("\n length will %0.3f times",o)
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