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=(2x.x).(2x.y).(2x.- z).(-3x.2x).(-3x.-4y).(-3x.3z)
=(2x²).(2xy).(-2xz).(-6x²).(-12xy).(-9xz)
=[(2x²).(-6x²)].[(2xy).(-12xy)].[(-2xz).(-9xz)]
=-12x⁴-24xy²+18xz