//chapter9
//example9.3
//page327
fc=1000;
C2=.005*10^-6;R1=33*10^3;//let assume
C3=C2;C=C2;
R3=1/(2*3.14*fc*C);
disp(R3)
R2=R3
Rf=.586*R1;
disp(Rf)