(a) State the value of [I-1 (b) Let f, g:Zx Z → Z × Z be two functions defined as follows: f (a,b) = (2a – b, b²) and g(a, b) = (ab?,b+ a) Find in simplified form expressions for each of the following: (i) fog(a, b); (ii) gof (a, b); (iii) fof (a,b).

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