factorize; {a^2 -9 (b-c)^2}
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[a²-9(b-c)²],
[a²-{3(b-c)}²],
[a+3(b-c)], [a-3(b-c)]
[a²-{3(b-c)}²],
[a+3(b-c)], [a-3(b-c)]
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