3. (a) For a given set A, consider the relation R= { (X, Y)|Χ ΕΡA) Υ ΕΡA) , and X Y) Show that R is a Partial Ordering relation. (b) Let the function f : R → R_ defined by 3x for x> 3 2x2 + 3 for – 2 < x< 3 3 x² – 7 for x<-2 f(x) = Find out f-(5).

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