(2a + 3b)² + ( 2b + 3a)²
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= (2a/3b + 2b/3a)2 = (2a/3b)2 + 2 (2a/3b) (2b/3a) + (2b/3a)2 = 4a2/9b2 + 8/9 + 4b2/9a2
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