Updates:
Status: Fixed
Comment #1 on issue 1728 by smi...@gmail.com: Variation of Parameters can
return solution with unnecessary -1 factored out
http://code.google.com/p/sympy/issues/detail?id=1728
In master, now:
dsolve(f(x).diff(x, x, x, x) - 4*f(x).diff(x, x) + 4*f(x) +
exp(sqrt(2)*x),
f(x),
... 'nth_linear_constant_coeff_undetermined_coefficients')
f(x) == (C1 + C2*x)*exp(-sqrt(2)*x) + (C3 + C4*x - x**2/16)*exp(sqrt(2)*x)
dsolve(f(x).diff(x, x, x, x) - 4*f(x).diff(x, x) + 4*f(x) +
exp(sqrt(2)*x),
f(x),
... 'nth_linear_constant_coeff_variation_of_parameters')
f(x) == (C1 + C2*x)*exp(-sqrt(2)*x) + (C3 + C4*x - x**2/16)*exp(sqrt(2)*x)
both answers are the same.
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