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Operational amplifiers and diodes

Hi guys! I have an Electricity exam tomorrow. So this is really urgent. There are 2 kinds of exercises I don't know how to do. The tests usually have similar exercises to these below:

1) Operational Amplifiers

Consider the circuit represented in the picture below. The voltage vi(t)=1sin(wt) V and the operational amplifier saturates in (+-)12V. Calculate and plot the signal of the voltage vo(t).

2) Diodes

Consider the circuit below. Plot the signal vo(t) (show your calculations [all of them]).

I really need your help! Thanks a lot!