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1. antzekoak
2. nabarmenak
3. Taldea 3

(x^2 - 1 ) / (x - 1)

2 x^2 + 4 x^2

a^2 + b^2 + 2 a b

6 x^2 + 2 -4 + 2

(a + b)^2

x + 1