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75(x+y)^2 - 48(x-y)^2...

`75(x+y)^2 - 48(x-y)^2`

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`75(x+y)^2-48(x-y)^2`
`75x^2+75y^2+150xy-48x^2-48y^2+96xy`
`27x^2+27y^2+246xy`.
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