2.求下列函数的Laplace逆变换(象原函数),并用另一种方法加以验证.-|||-(1) (s)=dfrac (1)({s)^2+(a)^2} ;-|||-(2) (s)=dfrac (s)((s-a)(s-b)) ;-|||-(3) (s)=dfrac (s+c)((s+a){(s+b))^2} ;-|||-(4) (s)=dfrac ({s)^2+2(a)^2}({({s)^2+(a)^2)}^2} :-|||-(5) (s)=dfrac (1)(({s)^2+(a)^2)(s)^3} ;-|||-(6) (s)=dfrac (1)(s(s+a)(s+b)) ;-|||-(7) (s)=dfrac (1)({s)^4-(a)^4} ;-|||-(8) (s)=dfrac ({s)^2+2s-1}(s{(s-1))^2} =-|||-(9) (s)=dfrac (1)({s)^2((s)^2-1)} ;-|||-(10) (s)=dfrac (s)(({s)^2+1)((s)^2+4)} -