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logは式全体にしかけれないから
右辺: log3 3^x - log3 3^-x
のように3のx乗と3の-x乗に分けてlogをつけてはいけない
右辺にlogをつけるなら
log3 (3のx乗-3の-x乗)

なるほど ありがとうございます!

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