factorise a ki power 8 minus b ki power 8
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a^8-b^8
(a^4)^2 - (b^4)^2
(a^4-b^4)(a^4 + b^4)
{(a^2)^2 - (b^2)^2}(a^4+b^4)
{(a^2+b^2)(a^2 - b^2)}(a^4+b^4)
{(a^2+b^2)(a-b)(a+b)}(a^4+b^4)
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