Answer :
We have,
1 – (b – c)2
= (1)2 – (b –c)2
By using the formula a2 – b2 = (a + b)(a – b)
We get,
1 – (b – c)2 = (1)2 – (b –c)2
= {1 + (b – c)}{1 – (b – c)}
= (1 + b – c)(1 – b + c)
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