Simplify and factorize
(a+b+c)^2 - (a-b-c)^2 +4b^2 -4c^2
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(A+B+C)²-(a-b-c)²+4b²-4c²
(a²+b²+c²+2ab+2bc+2ca)-(a-b-c)²+4b²-4c²......
(a²+b²+c²+2ab+2bc+2ca)-(a-b-c)²+4b²-4c²......
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