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(ax+by)^2+(bx-ay)^2=a²;x²;+2abxy+b²;y²;+b²;x²;-2abxy+a²;y²;=a²;x²;+b²;x²;+b²;y²;+a²;y²;=x²;(a²;+b²;)+y²;(a…
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