Mathematics
Senior High
次のURLの、zet さんの証明は正しいのでしょうか?教えていただけないでしょうか?すみません。
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q12118938107?__ysp=dGFuMcKw44GM54Sh55CG5pWw44Gn44GC44KL44GT44Go44Gu6Ki85piOemV0
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