The problem is in match, it stores the coefficient of non homogeneous euler
eq even after transformation into linear one.
for ex. the equation I used
eq = Eq(x**2*Derivative(f(x), x, x) - 2*x*Derivative(f(x), x) + 2*f(x),
log(x**2))
after transformation it becomes
Derivative(f(x), x, x) - 3*Derivative(f(x), x) + 2*f(x), log(x**2)
when I printed match inside
"def ode_nth_linear_constant_coeff_undetermined_coefficients(eq, func,
order, match):"
it returns
"{0: 2, 1: -2*x, 2: x**2, 'trialset': set([1, x]), -1: -log(x**2)}"
that is match for 1st eq but in
"ode_nth_linear_constant_coeff_undetermined_coefficients(eq, func, order,
match):"
I need to pass different match according to transformed eq
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