initial commit / add all books

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+//determine rise time,peak time,setlling time and peak overshoot 

+delta=0.5 // damping ratio

+w=6//rad/sec

+rt=(%pi-atan(sqrt((1-delta)/delta)))/(w*sqrt(1-delta^2));

+disp(rt,"the rise time is ")//seconds

+pt=%pi/(w*sqrt(1-delta^2));

+disp(pt,"peak time is")//seconds

+st=4/(delta*w);

+mo=exp((-%pi*delta)/sqrt(1-delta^2))*100;

+disp(st,"settling time(in seconds)")

+disp(mo,"maximum overshoot(in %)")