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+// Exa 6.7
+clc;
+clear;
+close;
+// Given Data
+fc= 1;// in kHz
+fc=fc*10^3;// in Hz
+Q=5;
+Af=8;
+// Let C=C1=C2=0.01 // in micro F
+C1= 0.01;// in micro F
+C1=C1*10^-6;// in F
+C2=C1;// in F
+C=C2;// in F
+R1= Q/(2*%pi*fc*C*Af);// in ohm
+R1=R1*10^-3;// in kohm
+R1=ceil(R1);
+R2= Q/(2*%pi*fc*C*(2*Q^2-Af));// in ohm
+R2=R2*10^-3;// in kohm
+R2=ceil(R2);
+R3= Q/(%pi*fc*C);// in ohm
+R3=R3*10^-3;// in kohm
+R3=ceil(R3);
+// The value of R2_desh required to change the centre frequency from 1 kHz to 2 kHz is
+f_desh_c= 2000;// in Hz
+R2_desh= R2*(fc/f_desh_c)^2;// in kohm
+disp(R1,"Value of R1 in kohm");
+disp(R2,"Value of R2 in kohm");
+disp(R3,"Value of R3 in kohm");
+disp(R2_desh,"Value of R2_desh in kohm");