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    Help please with the problem

    W is a standard exponential distribution. Q is distributed uniformly on [0,2pi] W and Q are independent. R=sqrt(2W) -pi/2<=a<=pi/2 - constant. U=Rcos(Q) V=Rsin(Q+a) Need to prove (U,V) has bivariate normal distribution with correlation equal to sin(a) Its hard for me to solve it, I...