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1.9 The purpose of this exercise is to reinforce your understanding of the use of Leibniz (1.5) along with a hint in proving two expressions equal. For each of the following pair of expressions E[z := X] and E[z := Y] , identify a hint X = Y that would show them to be equal and indicate what E is. Ez := X] Ez := Y] (Ity) . (ity) (xty) (y+x) (er + y) . (+3) (y + 2) . (y+I) ctytwte cty'wtz (y + w) .y.I T.Y'T I. T .A