Exercise
143
[1X4]Given \(f,g:β β β\) defined by \(f(n)=n^ 2-1\) and \(g(n)=(n+1)^ 2\), write explicitly \(fβ¦ g\) and \(gβ¦ f\), say if they coincide or are different functions.
EDB β 1X4
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