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//chapter18
//example17.3
//page398
fr=1200 // kHz
Q=60
BW=fr/Q
f1=fr-(BW/2)
f2=fr+(BW/2)
printf("bandwidth = %.3f kHz \n",BW)
printf("lower cut-off frequency = %.3f kHz \n",f1)
printf("upper cut-off frequency = %.3f kHz \n",f2)
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