1. Solve the di . system Y 0 = AY , if
A =
2
664
1 1 2
0 ????1 4
0 0 a
3
775
where a = 1 for

2. Find f analytic if
Re(f) =
x + a
(x + a)2 + y2 ; f(0) = i;
where
a = 1