64x⁶-1=(2x)⁶-1⁶={(2x)³-1³}{(2x)³+1³}=(2x-1){(2x)²+2x+1}(2x+1){(2x)²-2x+1}=(2x+1)(2x-1)(4x²+2x+1)(4x²-2x+1)
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