Mathematics
Senior High

赤の途中式からその次の(x³+1)(x³-1)になるのはなぜですか?

(6) (x+1)(x-1)(x²+x+1)(x2-x+1) - = {(x+1)(x2-x+1)}{(x-1)(x²+x+1)} = (x³+1)(x³-1)
数ⅰ 三次の乗法公式 レジェンド

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