Higher number: find the partial derivative of function. Z = (1 + XY) ^ y,

lnz=yln(1 + xy )
z=e^{yln(1 + xy )}
dz/dy=e^[yln(1 + xy )]{ln(1+xy)+xy/(1+xy)}
dz/dx=e^[yln(1 + xy )]{y^2/(1+xy)}

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9. It is known that f (x) is a function defined on R which is not always zero. For any x, y ∈ R, f (x · y) = XF (y) + YF (x) holds. & nbsp; sequence {an} satisfies an = f (2n) (n ∈ n *), and A1 = 2. Then the general term formula of sequence an=______ ．
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