Let x and y have a bivariate normal distribution and suppose that x and y both have

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Let x and y have a bivariate normal distribution and suppose that x and y both have mean 0 and variance 1, so that their marginal distributions arc standard normal and their joint density is 

-1 p(x, y) = {2 (1- p)] ' exp{-  (x  2pxy + y)/(1  p)}. .

Show that if the correlation coefficient between x and y is p, then that between x2 and y2 is p2.

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