the expression bx(a^2x^2 + 2a^2y^2 + b^2y^2) + ay(a^2x^2 + 2b^2x^2 + b^2y^2)/(ax + by)^2
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379+279+389+389+380+389+you 80/489+479+380+390+380+49+380+389+489+489(499-3894-499-4975-48
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