Mathematics
Senior High
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0°≦θ≦180° とする次の不等式を満たすθの値の範囲を求めよ
cosθ＞1/2
答え0°≦θ＜60°
わたしは60°＜θ≦180°
だと思ったんですけどなんで違うんですか?
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なるほど!ありがとうございます!