find g of f at the indicated point a.

g(x,y)= (x^2 * 3y, 3x-y^2)

f(x1, x2, x3)= (x1x3, (x2)/(x1x3) )

a= (3,1,-1)

so the matrix for D(g) is

2xy^3 3x^2 y^2

3 -2y

D(g(f(x1,x2,x3) is

(2(x2)^3)/(x1x3)^2 3(x2)^2

3 (-2x2)/(x1x3)

what is D(f) ?

i started with

x3 0 x1

but i dont know about the next row or if i even did the first row right.

any help? thanks so much