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//Ex7_7 Pg-372
clc
Rl=2*10^(3) //load resistance in ohm
Ri=500 //input resistance in ohm
C=2*10^(-6) //capacitor in microFarad
f=(1/(2*%pi*C*(Rl+Ri))) //textbook answer is wrong
printf("Lowest cut-off frequency = %.0f Hz",f)
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