Can I have detailed, step by step explanation for obtaining the answer of the following question?   Let Y1 and Y2 have joint density function given by,   f(y1, y2) =3(y1) ;  0 <= (y2) <= (y1) <= 1  or 0 ; otherwise Find Cov(Y1, Y2) and correlation coefficient(P).

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A: Total differential of a function z=fx,y is dz=∂z∂xdx+∂z∂ydy

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A: The integrating factor for given differential equation is

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Q: 26. Show that if a >1 and ß> 1, the beta density has a relative maximum at α-1 a+B-2 X =

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