Circuit Theorems in AC Analysis - Engineering

Q1:

Referring to the given circuit, determine ZTH as seen by RL.

A 1444–48.5° 

B 4176 –73.3° 

C 956 –48.5° 

D 1444 –73.3° 

ANS:A - 1444–48.5° 

Well as far as I know, Xc2 should also be negative, So,: ( (1.2-2i)^-1+(2^-1)i)^-1+.68 = 1.444<-48.58° K ohms.