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3.6 Using partial fraction expansion where required, find x(t) for (a) X(s)=(s+2)(s+3)(s+4)s(s+1) (b) X(s)=(s+2)(s+3)(s2+4)s+1 (c) X(s)=(s+1)2s+4 (d) X(s)=s2+s+11 (e) X(s)=s(s+2)(s+3)s+1e0.5s