Упростите выражение 
[tex](( x + y) ^{2} +( x +y) ^{2} ): ( \frac{x}{y} + \frac{y} x)[/tex] 
и найдите его значение при [tex] x= \sqrt{7} -1[/tex], [tex]y = \sqrt{7} + 1[/tex]
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