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Descompuneti in factori:
4(x-1)^2 - 4(x-1) + 1

(5x^2 - 1)^2 - y^2

7x^2 - 1

(2x-1)^2 - (x+3)^2

(4x-1)^2 -(5x+1)^2

a^4 - 4a^3 + 6a^3 - 4a +1