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IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions (id: 946b10a

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admin 发表于 2024-2-14 20:47:30 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions,类别为 IB数学

[填空题]
Two identical water waves pass a sensor in an ocev 8uw3dmds9)/ gngg5fe 4/ utut o75(hjnt)gyanograph3a shd.x -no0i4itw g2y laboratory. As the waves pass the sensor, the depth, D, in metres, of 3it wn-gsx04. odia h2water is recorded and modelled by the function
D(t)=3.21−0.45cos($24.2^{\circ}$$\times$t)
where t is the elapsed time, in seconds, since the first wave hit the sensor.
1.Find the minimum and maximum depths of the water as the two waves pass the sensor.$D_{min}$ =    ; $D_{max}$ =   
2.Find the first time after 1616 seconds at which the depth of water reaches 3.5m. t ≈   




参考答案:
空格1: 2.76±2%空格2: 3.66±2%空格3: 10.3±2%


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