transform of elementary functions

Submitted by sya on Wed, 11/24/2010 - 14:19.

General questions

evaluate :

$L( t^3-t^2+4t)=\frac{6}{s^4}-\frac{2}{s^3}+\frac{4}{s^2}$

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

$L ( \sinh kt )=\frac{k}{s^2-k^2}$

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