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//chapter-6,Example6_7,pg 494
R=10*10^5//scope input impedance
C1=0.31*62*10^-12//probe capacitance
C2=22*10^-12//probe input impedance
fcut=(1/(2*%pi*R*(C1+C2)))//cutoff frequency of filter
printf("cutoff frequency\n")
printf("fcut=%.2f Hz",fcut)
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