If H is the Hamiltonian for a free particle of mass m. the commutator [x, [x,H]] is?

1
\(\frac{\hbar^2}{m} \)
2
\(-\frac{\hbar^2}{m} \)
3
\(\frac{\hbar^2}{2 m} \)
4
\(-\frac{\hbar^2}{2 m} \)

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