gonzalez text

Hi

is there a mistake to Eg 5.5.1 on pg 421 of "Microwave Transistor Amplifier",2nd Ed by Guillermo Gonzalez ?

Would appreciate if someone could try and tell me if the value of Gamma-in gven is correct. I tried numerous times but I got Gamma-in=5.586arg(-6.281). I used the formula 3.2.5 on pg 214. Correct me if i used the wrong formula.

Thanks in advance!