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13. Prove that (i) Ü (4:). A; (U4) - UDA) () - 04 ns4) -(ÜB) - UPB, . r(n)- nra (iii) U F-'(B;) r (iv) В. n ='(B;).
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13. Prove that (i) Ü (4:). A; (U4) - UDA) () - 04 ns4) -(ÜB) - UPB, . r(n)- nra (iii) U F-'(B;) r (iv) В. n ='(B;).
13. Prove that (i) Ü (4:). A; (U4) - UDA) () - 04 ns4) -(ÜB) - UPB, . r(n)- nra (iii) U F-'(B;) r (iv) В. n ='(B;).