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Add the following: (i) ab-bc, bc-ca, ca-ab (ii) a-b+ab, b-c+bc, c-a+ac

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Add the following:
(i) ab-bc, bc-ca, ca-ab
(ii) a-b+ab, b-c+bc, c-a+ac
(iii) 2p2q2 - 3pq + 4, 5+ 7pq -3p2q2
(iv) l2+m2 ,m2+n2 ,n2+l2 + 2lm+ 2mn + 2nl

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