use Laplace transformations to solve initial value problem
x''+4x=cos(t), x(0)=0, x'(0)=0
set up the appropriate form of a particular solution, do not determine coefficients,
y''+6y'+13y=e-3x cos2x
find the Laplace transformation of the following function
f(t)=4cos(2t) + 7t3 - 5e-3t
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