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+//Example 15.4
+clc;
+
+C=2.2*10^-9; //in farads
+R=47*10^3; //in ohms
+x=2*%pi*R*C;
+fl=invr(x);
+printf('\nLower Cut Off frequency fl Of 2nd order Butterworth HPF = %.2f kHz\n',fl/1000) \ No newline at end of file