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Factroise (a^6-b^6)...

Factroise `(a^6-b^6)`

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We have
`(a^6-b^6)`
`=(a^3)^2-(b^3)^2`
`=(a^3-b^3)(a^3+b^3)`
`=(a-b)(a^2+ab+b^2)(a+b)(a^2-ab+b^2)`
` =(a-b) (a+b) (a^2+ab+b^2)(a^2-ab+b^2)`.
`therefore (a^6-b^6)=(a-b)(a+b)(a^2+ab+b^2)(a^2-ab+b^2)`.
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