If Cov(X,Y)=0.5Cov(X, Y) = 0.5Cov(X,Y)=0.5, Var(X)=1Var(X) = 1Var(X)=1, and Var(Y)=1Var(Y) = 1Var(Y)=1, what is the variance Var(X−Y)Var(X - Y)Var(X−Y)?
0
0.5
1
2