Very basic question which has confused me:(adsbygoogle = window.adsbygoogle || []).push({});

if the variance of an expectation value <A> is:

uncertainty of [tex]A=<(A-<A>)^2>^0.5 [/tex]

how is this equal to:

[tex](<A^2>-<A>^2)^0.5 [/tex]

??

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# Standard deviation of expectation values

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