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Year 11 Maths - Specialist Circular functions

Applications of trigonometric functions

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Questions
Question 1
75435

The depth, \(D(t)\) metres, of water at the entrance of a habour at \(t\) hours after midnight on a particular day is given by \(D(t) = 8 + 3\sin \left( {\dfrac{{\pi t}}{6}} \right),\,0 \le t \le 24\)

i) Sketch the graph of \(D(t)\) for \(0 \le t \le 24\)

ii) Find the values of \(t\) for which \(D(t) \ge 9.5\)

i) Refer to graph

ii) \(1 \le t \le 5\) and \(13 \le t \le 17\)

i) See adjacent graph

ii) For \(t\) values for \(D(t) \ge 9.5\), consider the blue line \(D(t)=9.5\).

\(1 \le t \le 5\) and \(13 \le t \le 17\)

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