If ax + by = 1 and bx + ay = 2ab/(a^2+b^2 ) then (x^2 + y^2) (a^2 + b^2) is equal to

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Скачать клип If ax + by = 1 and bx + ay = 2ab/(a^2+b^2 ) then (x^2 + y^2) (a^2 + b^2) is equal to