d) da y dx4 +81y = 0

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A: (1) L{eat}=1s−a,L{cos(at)}=ss2+a2,L{sin(at)}=1s2+a2,(2) L{δ(t−a)}=e−as,L{u(t−a)f(t−a)}=e−asL{f(t)}

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