Answer
$$g(u(x,y),v(x,y))=\pi xy\sin(\pi x^5y^7)$$
Work Step by Step
$$g(u(x,y),v(x,y))=g(x^2y^3,\pi xy)=\pi xy\sin((x^2y^3)^2\pi xy)=
\pi xy\sin(\pi x^5y^7)$$
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