(3x+1)²-(3x-1)²
=(3x+1+3x-1)(3x+1-(3x-1))
=(3x+1+3x-1)(3x+1-3x+1)
=6x*2
=12x
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(3x+1)²-(3x-1)²
=(3x+1+3x-1)(3x+1-(3x-1))
=(3x+1+3x-1)(3x+1-3x+1)
=6x*2
=12x