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波 h(t) = 3 sin(2pi t/12) m（潮汐）において、 t in [0, 12] のどの瞬間に高さが 1.5 m となるか？
波 h(t) = 3 sin(2pi t/12) m（潮汐）において、 t in [0, 12] のどの瞬間に高さが 1.5 m となるか？
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