Question: v?r(?? + ??) = =[(?? + ??) 21 - E[(?? + ??) ] 2 = E[? 2? 2 + 2???? + ? 2? 2] -

v?r(?? + ??) = =[(?? + ??) 21 - E[(?? + ??) ] 2 = E[? 2? 2 + 2???? + ? 2? 2] - [? = [?] + 26[?]] 2 = ? " E[? 2] + 2??E [??] + ? 2 E[? 2] - ? 2 6[?] 2 - 2??E [?]8[?] - ? 2 6[?]2 = ? "[6 [? " ] - B[?] 2] + ? 2 [8 [? 2 ] - B[?] 2] + 2??[E(??) - E(?)E(?) ] = ? 2 V?r [?] + ? 2v?r [?] + 2??c?V(?. ?)

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