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(X²+2√3x)(x²-2√3x)=x^4-12x²
(2x-1)³=8x³-12x²+6x-1
2. (a+b)(a-b)=a^2-b^2=x^4+4-12x^2
3.a^3 - 3a^2b + 3ab^2 - b^3= 8x^3 -12x^2 + 6x - 1