3. $$ 4 x^{2}, x y,-2 x y, 3 y^{2}, y^{2} $$

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The combined expression is $$ 4x^2 - xy + 4y^2 $$. It looks like you've provided a list of terms that could be part of a polynomial or an expression. If you would like to combine these terms or perform some operation with them, please specify what you would like to do. Here are the terms you've provided: 1. $$ 4x^2 $$ 2. $$ xy $$ 3. $$ -2xy $$ 4. $$ 3y^2 $$ 5. $$ y^2 $$ If you want to combine like terms, we can do that: - The terms $$ xy $$ and $$ -2xy $$ can be combined: $$ xy - 2xy = -xy $$ Now, let's rewrite the expression with the combined terms: $$ 4x^2 - xy + 3y^2 + y^2 $$ Next, combine the $$ 3y^2 $$ and $$ y^2 $$: $$ 3y^2 + y^2 = 4y^2 $$ So the final expression, combining all like terms, is: $$ 4x^2 - xy + 4y^2 $$ If you need further assistance or a different operation, please let me know!

3. \( 4 x^{2}, x y,-2 x y, 3 y^{2}, y^{2} \)

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3. \( 4 x^{2}, x y,-2 x y, 3 y^{2}, y^{2} \)

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