differential amplifier

hi, I have attached the circuit of CMOS and BJT differential amplifier, can any one help with the formula on how to calculate the output resistance of the circuit, assuming open circuit.

Thanx

We don't mind helping you but we won't do all of the work for you. Please post what you've already done including any ideas you've had and we might be able to make some suggestions. If you've got completely no idea then may be it's your lecuturer's fault and it isn't right that you make him/her look good by cheating and copying from the Internet.

Nice that you shared your professor's slides w/o credit...