(3x-1)(2x+1)(9x^2+1)(81x^4+1)
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((3x−1)(2x+1)(9x2+1))(81x4+1)=((3x−1)(2x+1)(9x2+1))(81x4)+((3x−1)(2x+1)(9x2+1))(1)=4374x8+729x7−243x6+81x5−81x4+54x4+9x3−3x2+x−1=4374x8+729x7−243x6+81x5−27x4+9x3−3x2+x−1
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