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LizaB15
17.07.2019 •
Mathematics
find the laplace transform of f(t) when:
f(t)= 9 , 0 = or < t < 2
f(t)= (t-5)^2 , 2= or < t < 5
f(t)= 2te^6t , t > or = 5
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Ответ:
and presumably 0 for
. We can express
in terms of the unit step function,
Quick explanation:
for
, and
for
. So subtracting these will cancel the value of 9 for all
and leave us with the value of 9 over the interval we want,
. The same reasoning applies for the other 3 terms.
Recall the time displacement theorem:
By this property, we have
Putting everything together, we end up with
Ответ: