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find initial value of, f(t)= 20-10t-e-25t verify using initial value theorem.
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limt0 f(t)=limt[2010te25t]=201=19

f(t)=2010te25t

Taking Laplace transform

f(s)=20s10s21s+25s(f)=2010sss+25

By initial value theorem

lims f(t)=lims[2010sss+25]=201=19

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