(江苏专用)2019高考数学二轮复习专题七应用题第22讲三角函数应用题冲刺提分作业.docx

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1第 22 讲 三角函数应用题1.(2018 苏州学业阳光指标调研)如图,B,C 分别是海岸线上的两个城市,两城市间由笔直的海滨公路相连,B,C 之间的距离为 100km,海岛 A 在城市 B 的正东方 50km 处.从海岛 A 到城市 C,先乘船按北偏西 角 航行到海滨公路 P 处登陆,再换乘汽车到城市 C.已知船速为( 0,函数 u()为增函数,12当 0 恒成立,所以 tanBPD=f(t)0,从而BPD ,而正切函数在 上为增函数,(0, 2) (0, 2)所以当 f(t)取最大值时,BPD 也最大.5

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