Var av diff
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Var(X−Y)=Var(X)+Var(Y)−2Cov(X,Y)\text{Var}(X-Y)=\text{Var}(X)+\text{Var}(Y)-2\text{Cov}(X,Y)Var(X−Y)=Var(X)+Var(Y)−2Cov(X,Y)
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