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Explain how this: E[w12u12+w22u22++wn2un2+2w1u1w2u2+2w1u1w3u3++2w2u2w3u3+2w2u2w4u4++2wn1un1wnun]\begin{array} { l } E \left[ w _ { 1 } { } ^ { 2 } u _ { 1 } { } ^ { 2 } + w _ { 2 } { } ^ { 2 } u _ { 2 } { } ^ { 2 } + \ldots + w _ { n } { } ^ { 2 } u _ { n } ^ { 2 } + 2 w _ { 1 } u _ { 1 } w _ { 2 } u _ { 2 } + 2 w _ { 1 } u _ { 1 } w _ { 3 } u _ { 3 } + \ldots \right. \\\left. + 2 w _ { 2 } u _ { 2 } w _ { 3 } u _ { 3 } + 2 w _ { 2 } u _ { 2 } w _ { 4 } u _ { 4 } + \ldots + 2 w _ { n - 1 } u _ { n - 1 } w _ { n } u _ { n } \right]\end{array}

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