Thanks. This is a bug so best to open a GitHub issue:
https://github.com/sympy/sympy/issues
If you use rational numbers rather than floats it gives the correct answer:
In [9]: print(dsolve(nsimplify(ode), y))
Eq(y(x), (C1 + C2*x)*exp(-x/2))
In [10]: print(dsolve(ode, y))
Eq(y(x), (C1*sin(5.9894
got wrong answer for this ODE y''+y'+0.25y=0, Out put attached. Correct
answer is (c_1+c_2*x)e^{-0.5x}. thank you
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