Table Of Laplace Transforms

some of the more commonly used Laplace transforms and formulas.
Estimated read time: 8 min
f(t)=L  1{F(s)}f\left( t \right) = {\mathcal{L}^{\,\, - 1}}\left\{ {F\left( s \right)} \right\} F(s)=L{f(t)}F\left( s \right) = \mathcal{L}\left\{ {f\left( t \right)} \right\}
1 11 1s\displaystyle \frac{1}{s}
2 eat{{\bf{e}}^{a\,t}} 1sa\displaystyle \frac{1}{{s - a}}
3 tn,     n=1,2,3,{t^n},\,\,\,\,\,n = 1,2,3, \ldots n!sn+1\displaystyle \frac{{n!}}{{{s^{n + 1}}}}
4 tp,     p>1{t^p},\,\,\,\,\,p > -1 Γ(p+1)sp+1\displaystyle \frac{{\Gamma \left( {p + 1} \right)}}{{{s^{p + 1}}}}
5 t\sqrt t π2s32\displaystyle \frac{{\sqrt \pi }}{{2{s^{\frac{3}{2}}}}}
6 tn12,     n=1,2,3,{t^{n - \frac{1}{2}}},\,\,\,\,\,n = 1,2,3, \ldots 135(2n1)π2nsn+12\displaystyle \frac{{1 \cdot 3 \cdot 5 \cdots \left( {2n - 1} \right)\sqrt \pi }}{{{2^n}{s^{n + \frac{1}{2}}}}}
7 sin(at)\sin \left( {at} \right) as2+a2\displaystyle \frac{a}{{{s^2} + {a^2}}}
8 cos(at)\cos \left( {at} \right) ss2+a2\displaystyle \frac{s}{{{s^2} + {a^2}}}
9 tsin(at)t\sin \left( {at} \right) 2as(s2+a2)2\displaystyle \frac{{2as}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
10 tcos(at)t\cos \left( {at} \right) s2a2(s2+a2)2\displaystyle \frac{{{s^2} - {a^2}}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
11 sin(at)atcos(at)\sin \left( {at} \right) - at\cos \left( {at} \right) 2a3(s2+a2)2\displaystyle \frac{{2{a^3}}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
12 sin(at)+atcos(at)\sin \left( {at} \right) + at\cos \left( {at} \right) 2as2(s2+a2)2\displaystyle \frac{{2a{s^2}}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
13 cos(at)atsin(at)\cos \left( {at} \right) - at\sin \left( {at} \right) s(s2a2)(s2+a2)2\displaystyle \frac{{s\left( {{s^2} - {a^2}} \right)}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
14 cos(at)+atsin(at)\cos \left( {at} \right) + at\sin \left( {at} \right) s(s2+3a2)(s2+a2)2\displaystyle \frac{{s\left( {{s^2} + 3{a^2}} \right)}}{{{{\left( {{s^2} + {a^2}} \right)}^2}}}
15 sin(at+b)\sin \left( {at + b} \right) ssin(b)+acos(b)s2+a2\displaystyle \frac{{s\sin \left( b \right) + a\cos \left( b \right)}}{{{s^2} + {a^2}}}
16 cos(at+b)\cos \left( {at + b} \right) scos(b)asin(b)s2+a2\displaystyle \frac{{s\cos \left( b \right) - a\sin \left( b \right)}}{{{s^2} + {a^2}}}
17 sinh(at)\sinh \left( {at} \right) as2a2\displaystyle \frac{a}{{{s^2} - {a^2}}}
18 cosh(at)\cosh \left( {at} \right) ss2a2\displaystyle \frac{s}{{{s^2} - {a^2}}}
19 eatsin(bt){{\bf{e}}^{at}}\sin \left( {bt} \right) b(sa)2+b2\displaystyle \frac{b}{{{{\left( {s - a} \right)}^2} + {b^2}}}
20 eatcos(bt){{\bf{e}}^{at}}\cos \left( {bt} \right) sa(sa)2+b2\displaystyle \frac{{s - a}}{{{{\left( {s - a} \right)}^2} + {b^2}}}
21 eatsinh(bt){{\bf{e}}^{at}}\sinh \left( {bt} \right) b(sa)2b2\displaystyle \frac{b}{{{{\left( {s - a} \right)}^2} - {b^2}}}
22 eatcosh(bt){{\bf{e}}^{at}}\cosh \left( {bt} \right) sa(sa)2b2\displaystyle \frac{{s - a}}{{{{\left( {s - a} \right)}^2} - {b^2}}}
23 tneat,     n=1,2,3,{t^n}{{\bf{e}}^{at}},\,\,\,\,\,n = 1,2,3, \ldots n!(sa)n+1\displaystyle \frac{{n!}}{{{{\left( {s - a} \right)}^{n + 1}}}}
24 f(ct)f\left( {ct} \right) 1cF(sc)\displaystyle \frac{1}{c}F\left( {\frac{s}{c}} \right)
25 uc(t)=u(tc){u_c}\left( t \right) = u\left( {t - c} \right) ecss\displaystyle \frac{{{{\bf{e}}^{ - cs}}}}{s}
26 δ(tc)\delta \left( {t - c} \right) ecs{{\bf{e}}^{ - cs}}
27 uc(t)f(tc){u_c}\left( t \right)f\left( {t - c} \right) ecsF(s){{\bf{e}}^{ - cs}}F\left( s \right)
28 uc(t)g(t){u_c}\left( t \right)g\left( t \right) ecsL{g(t+c)}{{\bf{e}}^{ - cs}}{\mathcal{L}}\left\{ {g\left( {t + c} \right)} \right\}
29 ectf(t){{\bf{e}}^{ct}}f\left( t \right) F(sc)F\left( {s - c} \right)
30 tnf(t),     n=1,2,3,{t^n}f\left( t \right),\,\,\,\,\,n = 1,2,3, \ldots (1)nF(n)(s){\left( { - 1} \right)^n}{F^{\left( n \right)}}\left( s \right)
31 1tf(t)\displaystyle \frac{1}{t}f\left( t \right) sF(u)du\int_{{\,s}}^{{\,\infty }}{{F\left( u \right)\,du}}
32 0tf(v)dv\displaystyle \int_{{\,0}}^{{\,t}}{{\,f\left( v \right)\,dv}} F(s)s\displaystyle \frac{{F\left( s \right)}}{s}
33 0tf(tτ)g(τ)dτ\displaystyle \int_{{\,0}}^{{\,t}}{{f\left( {t - \tau } \right)g\left( \tau \right)\,d\tau }} F(s)G(s)F\left( s \right)G\left( s \right)
34 f(t+T)=f(t)f\left( {t + T} \right) = f\left( t \right) 0Testf(t)dt1esT\displaystyle \frac{{\displaystyle \int_{{\,0}}^{{\,T}}{{{{\bf{e}}^{ - st}}f\left( t \right)\,dt}}}}{{1 - {{\bf{e}}^{ - sT}}}}
35 f(t)f'\left( t \right) sF(s)f(0)sF\left( s \right) - f\left( 0 \right)
36 f(t)f''\left( t \right) s2F(s)sf(0)f(0){s^2}F\left( s \right) - sf\left( 0 \right) - f'\left( 0 \right)
37 f(n)(t){f^{\left( n \right)}}\left( t \right) snF(s)sn1f(0)sn2f(0)sf(n2)(0)f(n1)(0){s^n}F\left( s \right) - {s^{n - 1}}f\left( 0 \right) - {s^{n - 2}}f'\left( 0 \right) \cdots - s{f^{\left( {n - 2} \right)}}\left( 0 \right) - {f^{\left( {n - 1} \right)}}\left( 0 \right)


This list is not a complete listing of Laplace transforms and only contains some of the more commonly used Laplace transforms and formulas.

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