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regra do produto

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boas pessoal gostaria de saber que:

2(x-1).(x-1)'.(x+3)+(x-1)2.1 =

a minha duvida esta nesta passagem, como pode ser este o resultado n estou a perceber, só tenho este exemplo, n percebo, ja procurei varias informações mas n percebo

= 2x2 + 6x - 2x - 6 + x2 - 2x + 1

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