How to find Vout for the following band pass filter
Left hand side is ok,

Right hand side equation is not.

$$R_{eq}= R_2//(R_3+\frac{1}{SC_2})$$

Then 

$$V_{IN}=V_{IN1}\frac{R_{eq}}{R_{eq} + R_{1} + \frac{1}{SC_{1}}  }$$

Note: 
$$X//Y  = \frac{1}{X^{-1} + Y^{-1}}$$
and
$$s = wj$$