output voltage of differential amplifier

1. The problem statement, all variables and given/known data



Find output voltage of differential amplifier having differential gain of 100 and common mode gain 0.1 if input voltages are v1=2+0.55sinwt and v2=0.5-0.005sinwt



2. Relevant equations







3. The attempt at a solution



well, from sedra smith book i found the formula for output book



v0= Ad(v1-v2)+Acm(v1+v2)/2



if i have to subtract two AC signals with dc offsets i get v1-v2= 1.5+0.55sinwt am i correct?



so can right it as 2.11sinwt

again for Acm i have to take average of two signals which will be 1.25+0.272sinwt



i have to divide it by 2 hence it becomes 1.522sinwt



the final ans i am getting is 211.15sinwt am i correct?