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Functions of several variables composition

Mathematica Asked by janmarqz on September 1, 2021

If we have two functions $G,F:mathbb R^2tomathbb R^2$ then the mechanism
$Fcirc G(x,y)=F(G(x,y))$ gives us a new map $Fcirc G:mathbb R^2tomathbb R^2$ called its composition.

In a "schematic" view, and with two functions for an example,
we would write
$$
left(begin{array}{c}xyend{array}right)
stackrel{G}to
left(begin{array}{c}x^2y2yend{array}right)qquad {rm and}qquad
left(begin{array}{c}xyend{array}right)
stackrel{F}to
left(begin{array}{c}x-yxend{array}right)
$$

then
$$
left(begin{array}{c}xyend{array}right)
stackrel{Fcirc G}longrightarrow
left(begin{array}{c}x^2y-2yx^2yend{array}right).
$$

How could this process be programmed in Mathematica12?

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