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+//ex15.3
+R_A=1*10^3;
+R2=1*10^3;
+R_B=R_A;
+R=R_A;
+C_A=0.022*10^-6;
+C_B=C_A;
+C=C_A;
+f_c=1/(2*%pi*R*C); //critical frequency
+R1=0.586*R2; //for butterworth response
+disp(f_c,'critical frequency in hertz')
+disp(R1,'value of R1 in ohms') \ No newline at end of file