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Mathematics 13 Online
OpenStudy (anonymous):

Laplace of the following: L { t ∗ 4δ (t-1) ∗ u(t-2) }

OpenStudy (anonymous):

I know how to do it for 2 functions, but am not sure how to go about it for 3

OpenStudy (zzr0ck3r):

why not the definition?

OpenStudy (zzr0ck3r):

hmm I forget how to do this, that is the dirac and heaviside functions?

OpenStudy (anonymous):

yeah they are the dirac and heaviside. Can I write\[ L{f(t)*g(t)*h(t)} = F(s)G(s)H(s)\]

OpenStudy (zzr0ck3r):

well from - infinity to 2 its going to be 0 right?

OpenStudy (zzr0ck3r):

hmm undeifined at 1

OpenStudy (anonymous):

I guess so...I don't understand the heaviside or dirac function so well, Sort of just follow the formula

OpenStudy (zzr0ck3r):

heaviside u(t-a) is 0 below (a) and 1 above and dirac(t-b) is infinite at b but the area under the graph is always one

OpenStudy (zzr0ck3r):

so i think since its 0 up untill 2 and the dirac will be area 1 at 1 all we have to look at is int(4t*e^9-st) from 2 to infinity

OpenStudy (zzr0ck3r):

hmm maybe not, I have to go to a party man, sorry I cant help more. good luck

OpenStudy (anonymous):

np, thanks for trying anyway

OpenStudy (anonymous):

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