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※2乗してから積を考えるのでなく
 積を考えてから2乗すると楽になる場合があります

(5) (a+b)²(aーb)²(a⁴+a²b²+b⁴)²

 ={(a+b)(a-b)}²(a⁴+a²b²+b⁴)²

 =(a²-b²)²(a⁴+a²b²+b⁴)²

 ={(a²-b²)(a⁴+a²b²+b⁴)}²

 ={a⁶-b⁶}²

 =a¹²-6a⁶b⁶+b¹²

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