- Which of the following formulas define norms on R²? (Let (x, y) be the co- ordinates in R².) (a) (x² + xy + y²) ¹/²; (c) (x+y |) ²; (b) (d) (x²− 3xy + y²) ¹/²; 1/2 (x+| y |) + ¾/3 (x² + y²) ¹/².

Q: .

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A: By the set inequality i have solved the problem

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A: we only solve one polynomial at a time so please submit questions one by one.