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4-4(1-a)+(1-a)²
4-4(1-a)+1²-2(1)(a)+a²
4-4(1-a)+1-2a+a²
4-4+4a+1-2a+a²
a²+4a-2a+1
a²+2a+1
2 -(1-a)/ -2(1-a)
2 -(1-a)/ -2(1-a)
aqui te lo pongo mejor...
(2-(1-a) )^2
espero te ayude