Question: How do I solve a Non-autonomous differential equation in Maple

ODE := 2.56*(diff(x(t), t, t))+.32*(diff(x(t), t))+x(t)+0.5e-1*x(t)^3 = 2.5*sin(t)

a1 := 2.56; a2 := .32; a3 := 0.5e-1; B := sin(t)

dfieldplot([diff(x(t), t) = y(t), diff(y(t), t) = (B-a2*y(t)-x(t)-a3*x(t)^3)/a1], [x(t), y(t)], t = -2 .. 2, x = -1 .. 2, y = -1 .. 2, arrows = SLIM, color = black, dirfield = [10, 10])

Error, (in DEtools/dfieldplot) cannot produce plot, non-autonomous DE(s) require initial conditions.
 

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