Cov(X,Y)=\text{Cov}(X,Y)=Cov(X,Y)=
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E[(X−μX)(Y−μY)]E[(X-\mu_X)(Y-\mu_Y)]E[(X−μX)(Y−μY)]. = E[XY]−E[X]E[Y]E[XY]-E[X]E[Y]E[XY]−E[X]E[Y].
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