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Simplify: 1/3(6x^2+15 y^2)(6x^2-15 y^2)...

Simplify: `1/3(6x^2+15 y^2)(6x^2-15 y^2)`

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`1/3(6x^2+15y^2)(6x^2-15y^2)`
`[6x^2xx1/3+15y^2xx1/3]xx(6x^2-15y^2)`
`(2x^2+5y^2)xx(6x^2-15y^2)`
`2x^2(6x^2-15y^2)+5y^2(6x^2-15y^2)`
`12x^4-30x^2y^2+30x^2y^2-75y^2`
`12x^4-75y^4`
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