inverselaplace 1/(((s+1)^2+4))

解答

的拉普拉斯逆变换

\frac{1}{( ( s + 1 ) ^{2} + 4 )}

e^{- t} \frac{1}{2} sin (2 t)

求解步骤

L^{- 1} ⎩ ⎨ ⎧ \frac{1}{( ( s + 1 ) ^{2} + 4 )} ⎭ ⎬ ⎫

应用逆变换法则: if

L^{- 1} {F (s)} = f (t)

则

L^{- 1} {F (s - a)} = e^{a t} f (t)

对于

\frac{1}{( s + 1 ) ^{2} + 4} : a = - 1, F (s) = \frac{1}{s ^{2} + 4}

= e^{- t} L^{- 1} {\frac{1}{s ^{2} + 4}}

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

= e^{- t} \frac{1}{2} sin (2 t)

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