what is the difference between acov(x)and a cov(AX)=Acov(X)A a cov x a what is the theorem a cov(X) a? where does the expression cov(AX) come from what is a cov(x) ax cov(x)a' why is cov(x)=a what is covax why is cov(ax) equal to a cov(x) A how to calculate cov(ax) cov(x) a' means which ax is equal to acov(x) a? what does cov(ax) mean why does cov(x) mean a what is the a cov(ax) how do you find a constant cov what is theorem ax mean what is cov(ax)/acov(x)a' how to use cov(x) ax