(a²＋2ab＋b²－c²)(a²－2ab＋b²－c²)
＝{(a＋b)²－c²}{(a－b)²－c²}
＝(a＋b)²(a－b)²－(a＋b)²c²－(a－b)²c²＋c⁴
＝{(a＋b)(a－b)}²－{(a＋b)²－(a－b)²}c²＋c⁴
＝{a²－b²}²－{4ab}c²＋c⁴
＝a⁴－2a²b²＋b⁴－4abc²＋c⁴
＝a⁴＋b⁴＋c⁴－2a²b²－4abc²
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