d^4/dt^4 (3t^3 * u(t)) + 2*(d^3/dt^3 (3t^3 * u(t))) + 5*(d^2/dt^2 (3t^3 * u(t))) + 1*(d/dt (3t^3 * u(t))) + 1*(d^4/dt^4 (3t^3 * u(t)))

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