What is inverse oflaplace 3/(s*(s^2+2s+5)) ?

The answer to inverse oflaplace 3/(s*(s^2+2s+5)) is 3/5 \H(t)-3/5 e^{-t}cos(2t)-3/10 e^{-t}sin(2t)

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inverse oflaplace 3/(s*(s^2+2s+5))

inverse laplace

\frac{3}{s \cdot ( s ^{2} + 2 s + 5 )}

\frac{3}{5} H (t) - \frac{3}{5} e^{- t} cos (2 t) - \frac{3}{10} e^{- t} sin (2 t)

Solution steps

L^{- 1} {\frac{3}{s ( s ^{2} + 2 s + 5 )}}

Take the partial fraction of

\frac{3}{s ( s ^{2} + 2 s + 5 )} : \frac{3}{5 s} + \frac{- 3 s - 6}{5 ( s ^{2} + 2 s + 5 )}

= L^{- 1} {\frac{3}{5 s} + \frac{- 3 s - 6}{5 ( s ^{2} + 2 s + 5 )}}

Expand

\frac{- 3 s - 6}{5 ( s ^{2} + 2 s + 5 )} : - \frac{3}{5} \cdot \frac{s + 1}{( s + 1 ) ^{2} + 4} - \frac{3}{5} \cdot \frac{1}{( s + 1 ) ^{2} + 4}

= L^{- 1} {\frac{3}{5 s} - \frac{3}{5} \cdot \frac{s + 1}{( s + 1 ) ^{2} + 4} - \frac{3}{5} \cdot \frac{1}{( s + 1 ) ^{2} + 4}}

Use the linearity property of Inverse Laplace Transform:

For functions

f (s), g (s)

and constants

a, b : L^{- 1} {a \cdot f (s) + b \cdot g (s)} = a \cdot L^{- 1} {f (s)} + b \cdot L^{- 1} {g (s)}

= L^{- 1} {\frac{3}{5 s}} - \frac{3}{5} L^{- 1} {\frac{s + 1}{( s + 1 ) ^{2} + 4}} - \frac{3}{5} L^{- 1} {\frac{1}{( s + 1 ) ^{2} + 4}}

L^{- 1} {\frac{3}{5 s}} : \frac{3}{5} H (t)

L^{- 1} {\frac{s + 1}{( s + 1 ) ^{2} + 4}} : e^{- t} cos (2 t)

L^{- 1} {\frac{1}{( s + 1 ) ^{2} + 4}} : e^{- t} \frac{1}{2} sin (2 t)

= \frac{3}{5} H (t) - \frac{3}{5} e^{- t} cos (2 t) - \frac{3}{5} e^{- t} \frac{1}{2} sin (2 t)

Refine

\frac{3}{5} H (t) - \frac{3}{5} e^{- t} cos (2 t) - \frac{3}{5} e^{- t} \frac{1}{2} sin (2 t) : \frac{3}{5} H (t) - \frac{3}{5} e^{- t} cos (2 t) - \frac{3}{10} e^{- t} sin (2 t)

= \frac{3}{5} H (t) - \frac{3}{5} e^{- t} cos (2 t) - \frac{3}{10} e^{- t} sin (2 t)

\int_{0}^{2 π} cos (x) cos (2 x) d x

\int sin^{3} (x) cos^{8} (x) d x

\int (x^{2} - 3)^{2} (2 x) d x

x \to 0 + lim (\frac{1}{3 x})

\int \frac{9}{x ^{2} + 9} d x

What is inverse oflaplace 3/(s*(s^2+2s+5)) ?
The answer to inverse oflaplace 3/(s*(s^2+2s+5)) is 3/5 \H(t)-3/5 e^{-t}cos(2t)-3/10 e^{-t}sin(2t)