Question: If f ( x ) and g ( x ) are inverse functions of each other, which of these equations does not always hold? g(f(x))=x

If f(x) and g(x) are inverse functions of each other, which of these equations does not always hold?
g(f(x))=x
f(g(x)=x
f(x)g(x)=1
f(x)=g-1 (x)

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