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How is (x-y)^2 + (X^2+2xy+y^2) simplified to 2x^2+2y^2?
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How is (x-y)^2 + (X^2+2xy+y^2) simplified to 2x^2+2y^2?

User Madagaga
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Solve using identities (x-y)² when opened becomes x²-2xy+y² now add second equation amd tou will get the ans
User Dan Nolan
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