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Multiply (3x^2+y^2)\ by\ (x^2+2y^2)dot...

Multiply `(3x^2+y^2)\ ` by`\ (x^2+2y^2)dot`

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`(3x^2+y^2)xx(x^2+2y^2)`
`x^2(3x^2+y^2)+2y^2(3x^2+y^2)`
`3x^4+x^2y^2+6x^2y^2+2y^2`
`3x^4+7x^2y^2+2y^4`
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