Hello dear StackExchange community, I have an exam next week, and I need to get a real high mark to pass. Therefore I'm looking for some hard questions to solve, and this is one.  

Well I don't expect a full solution from you here, but some guidance would be nice.

1. What does "assuming B of BJT's are very high" mean?
2. How do we seperate the 1 mA source to the differential pair? Because the solution guide here: http://www.chegg.com/homework-help/microelectronic-circuits-6th-edition-chapter-10-problem-11e-solution-9780195323030

says that it is evenly distributed. How?

I have an exam next week, and I need to get a real high mark to pass. Therefore I'm looking for some hard questions to solve, and this is one. 

While I don't expect a full solution from you here, some guidance would be nice.

1. What does “assuming B of the BJTs is very high” mean?
2. How do we seperate the 1 mA source to the differential pair? Because the solution guide says that it is evenly distributed. How?