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Add 9x^(2) + 13xy + y^(2) and 6y^(2) - 2...

Add `9x^(2) + 13xy + y^(2)` and `6y^(2) - 2xy + 21x^(2)`

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The correct Answer is:
`9x^(2) + 2xy + 4y^(2)`
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