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The joint probability density function of X and Y is bivariate normal with E(X)=E(Y)=0, sd(x)=sd(y)=9, and...

The joint probability density function of X and Y is bivariate normal with E(X)=E(Y)=0, sd(x)=sd(y)=9, and correlation coefficient is 0. Find:
(a) P(X=<6, Y=<12);
(b) P(X^2+Y^2=<36)
Math   Advanced-Math   
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