HW 2

Read Ross section 7-9, especially p51-p54 where $\lim = \pm \infty$ are discussed.
Do the exercises, but no submssions are required
- 7.1, 7.2, 7.3
Submit the following problems
- 7.4, 7.5(a)
- 8.2（e), 8.4
- 9.1 ( c) , 9.2(b), 9.3, 9.4, 9.9( c)