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1/(x+y+1)³ = (x+y+1)⁻³ ですね。
これで計算が合うようになります。

【参考】1/³√(x+y+1) = (x+y+1)⁻¹‘³

ひきわり

初歩的なミスでした..
ご指摘ありがとうございます。

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