What is expectation values of this anti-commutator $\langle \{ \Delta \hat x,\Delta \hat p\} \rangle~?$
where the $\Delta \hat p=\hat p-\langle \hat p \rangle$ and $\hat p$ is momentum operator and so $\Delta \hat x=\hat x-\langle \hat x \rangle$ and $\hat x$ is position operator operator.
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