Hằng ngày, mực nước của một con kênh lên xuống theo thủy triều. Độ sâu h (mét) của mực nước trong kênh tính theo thời gian t (giờ) trong một ngàyopen parentheses 0 less or equal than t less than 24 close parentheses cho bởi công thức h equals 2 sin open parentheses 3 fraction numerator pi t over denominator 14 end fraction close parentheses open parentheses 1 minus 4 sin squared open parentheses fraction numerator pi t over denominator 14 end fraction close parentheses close parentheses plus 12.Hỏi trong một ngày có bao nhiêu lần mực nước trong kênh đạt độ sâu 13m.

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