The inverse Laplace transform of the functionF (s) =1is

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The inverse Laplace transform of the function
F (s) = 1 is given by
s(s + 1)

1. f(t) = sin t
2. f(t) = e^{- t} sint
3. f(t) = e^{- t}
4. f(t) = 1 – e^{- t}

Correct Option: D

L^-1		1		=	1	-	1
		s(s + 1)			s		s + 1

L^-1		1	-	1		= 1 - e^-t
		s		s + 1