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I have hard time understanding composition of functions in several variables.
Suppose [tex]f(x,y)=(xcosy,\frac {x-y}{y-x})[/tex], how should I write f(f(x,y))?
Suppose [tex]f(x,y)=(xcosy,\frac {x-y}{y-x})[/tex], how should I write f(f(x,y))?