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diff --git a/863/CH1/EX1.8/Ex1_8.txt b/863/CH1/EX1.8/Ex1_8.txt
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+//Caption:Determine (a)upper cutoff frequency (b)lower cutoff frequency
+//Ex:1.8
+clc;
+clear;
+close;
+f=1//frequency of square wave(in khz)
+tr=200//rise time of output(in ns)
+t=0.03//fractional tilt
+fh=0.35*10^3/tr
+disp(fh,'(a)upper cutoff frequency(in mhz)=') 
+fl=f*t*1000/%pi
+disp(fl,'(b)Lower cutoff frequency(in hz)=')
+\ No newline at end of file