Question: Prove the useful computing formula (Equation 11.3.5) that --' - -- i=1 i=l i=l i=1

Prove the useful computing formula (Equation 11.3.5) that
Συ--βα' - ΣΥ-ΣΥ-ΑΣν i=1 i=l i=l i=1

--' - -- i=1 i=l i=l i=1

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