476 Appeiidix A Solutions i,o the>Exerciseh A2 d l! s+-f ds = lim - [ F ( s ) (*s A1 = (I" 2! 10* lirn -[F'(s) (s i s-i-I 5=-1 ( s + 1)2 + I - arid A3 I- 4)2 (s - -+ - : (5 S=-l ( s + 4) + 4)' 5=-1 I s F(s) = =- d.s2 -J8 ( s + 4)' Lz + l)"]= ( s +(s4)+-4)(22 s - 1) (6 t 1)3 1 + -3 s t = -1 can be c.dculated its in a) Eqiiat,iiig coefficients is tfieri possiblc with only two more eqw