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Senior High
Mathematics
テスト質問
Senior High
Mathematics
テスト
Senior High
Mathematics
てすと
Senior High
Mathematics
test badge notification
Senior High
Mathematics
test notification
Senior High
Mathematics
test notification
Senior High
Mathematics
QA push test
Senior High
Mathematics
QA TEST No.2
Senior High
Mathematics
QA TEST
Senior High
Mathematics

x^50に1を代入すると1です。
x^50に-1を代入すると1です。
上の式において下の二式では左辺と右辺が入れ替わってます