(a+2b)^2 - (a-2b)^2=________

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(a+2b)^2 - (a-2b)^2=________
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(a+2b)^2 - (a-2b)^2=________
(a+2b)^2 - (a-2b)^2=________

(a+2b)^2 - (a-2b)^2=________
(a+2b+a-2b)(a+2b-a+2b)
=2a*4b
=8ab