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mursalovasuriya

 frac{4}{9}  {a}^{2}  - 2ab +  frac{9}{4}  {b}^{2}  = \   = { (frac{2}{3} a)}^{2}  - 2 times  frac{2}{3} a times  frac{3}{2} b + ( { frac{3}{2} b)}^{2} =   \  =  {( frac{2}{ 3} a -  frac{3}{2}b) }^{2}

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