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Mathematics, 29.01.2020 20:44 Ezonthekid

Verify the identity: (a^2+b^2)(x^2+y^2)=(ax-by)^2+(bx+ay )^2

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Verify the identity: (a^2+b^2)(x^2+y^2)=(ax-by)^2+(bx+ay )^2...
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