(1 - a - b)(1 - a + b)
(1 + a - b)(1 - a + b)
(1 - a + b)(1 - a + b)
(1 + a + b)(1 + a + b)
Correct answer is B
1 - (a - b)2 = [1 + (a - b)][1 - a + b] = (1 + a - b)(1 - a + b)
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