//chapter 12
//example 12.9
//page 493
printf("\n")
printf("given")
hfe=50;re=26;R1=68*10^3;R2=47*10^3;rs=600;f1=75;R5=3.9*10^3;Rl=40*10^3;
hie=(1+hfe)*re
Zi=(R1*R2*hie)/(R1*R2+R1*hie+R2*hie)
Xc1=(Zi+rs)/10
C1=1/(2*3.14*f1*Xc1)
Xc2=.65*re
Xc3=Xc2;
C2=1/(2*3.14*f1*Xc2)
C3=C2;
Xc4=(R5+Rl)/10
C4=1/(2*3.14*f1*Xc4)