Help - Amplifier circuit analyse

Hi,
I'm new in electronics and I need some help analysing a circuit.

I want to determine Vout/Vi but the Rc is confusing me.
I need to find the common mode voltage and the differencial mode voltage.

I also want to determine Vout/Vi admiting that R doesn´t exists.

Thanks

Cc limits the upper frequeny.

Rc isn't needed.

The gain equals the impedance of Cc divided by R.

At DC Cc is open circuit so the gain of the amplifier is equal to the op-amp's open loop gain which could be as high as a million.

You have an integrator whose gain decreases by 6db/octave.