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Mathematics, 26.01.2020 20:31 tessadummer0033

What should be subtracted from 3x^2-4y^2+5xy+20 to obtain x^2+y^2+6xy+20?

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What should be subtracted from 3x^2-4y^2+5xy+20 to obtain x^2+y^2+6xy+20?...
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