//chapter 9
//example 9.2
//page 324
Ao=2;fc=10*10^3;
Rf=10*10^3;//let choose
//Ao=1+(RF/R1)
R1=Rf/(Ao-1);
disp(R1)
C=.001*10^-6;
R=1/(2*3.14*fc*C);
disp(R)