108a2- 3(b-c)2 factorise
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08a^2 - 3 (b - c)^2
=> 3 [ 36a^2 - (b-c)^2]
=> 3 [ (6a)^2 - (b-c)^2]
=> 3 (6a + b - c) (6a - b + c)
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