I'm sure both of them will be really serious to win the second leg. This derby match is always interesting, and AC Milan always performs better when playing derby matches, compared to playing against other clubs. The second leg will take place on April 24 and before that, Inter have some pretty tough matches, namely in UCL against Bayern Munich on April 17 and in Serie A against Bologna on April 20. So, hopefully this doesn't affect the performance and condition of Inter players that much.
Of course this will really drain the energy of Inter players with a tight schedule and also a big match waiting, but I am sure Inter will come out as the winner in the Coppa Italia because Milan is very bad, to be honest Milan is not a tough opponent for Inter but talking about these two clubs they have a fantastic duel in Italy that's why it will affect Inter a little, but I am very sure with what they go through Inter they can win the match if there are no obstacles they get, and Inter can also still get a treble winner so their fighting spirit is still very high.
Milan is currently having quite a hard time with what they do with the luxurious players they have at this time but unfortunately they seem to be divided from each other that's why the opportunities they have often fail to reach the target, Felix who was sprayed by Walker in the previous match it was clear that they were not yet fluid with each other and Milan's forwards are still looking for themselves, that's why I will be very sure to side with Inter.