Factorise :
a - b - 4a2 + 4b2
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Given,
= a - b - 4(a2 - b2)
= (a - b) - 4(a + b)(a - b)
= (a - b)[1 - 4(a + b)]
= (a - b)(1 - 4a - 4b).
Hence, a - b - 4a2 + 4b2 = (a - b)(1 - 4a - 4b).
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