(a+2b)(a-2b)(a²+4b²)=

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(a+2b)(a-2b)(a²+4b²)=
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(a+2b)(a-2b)(a²+4b²)=
(a+2b)(a-2b)(a²+4b²)=

(a+2b)(a-2b)(a²+4b²)=
a4-16b4