//chapter 19
//example 19.17
//page 858
printf("\n")
printf("given")
f=50;R1=100*10^3;R2=1*10^3;R8=2.7*10^3;R9=R8;
C1=1/(2*3.14*f*.1*R1)
C2=1/(2*3.14*f*R2)
Xc3=.1*((R8*R9)/(R8+R9))
C3=1/(2*3.14*f*Xc3)
C4=C3