如图所示,为积极开展“最美怀化”建设,我市某校中学现拟在边长为0.6千米的正方形地块
上划出一片三角形地块
建设小型生态园,点
分别在边
上.
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696020233838592/2787463155998720/STEM/f86e7d21-2e1e-4372-9e72-ea4563ed2c15.png?resizew=230)
(1)当点
分别是边
中点和
靠近
的三等分点时,求
的正切值;
(2)实地勘察后发现,由于地形等原因,
的周长必须为1.2千米,请研究
是否为定值,若是,求此定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696020233838592/2787463155998720/STEM/f86e7d21-2e1e-4372-9e72-ea4563ed2c15.png?resizew=230)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f8eff113ca3f0d0200253c7c2f5a7a.png)
(2)实地勘察后发现,由于地形等原因,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f8eff113ca3f0d0200253c7c2f5a7a.png)
20-21高一上·湖南怀化·期末 查看更多[3]
湖南省怀化市2020-2021学年高一上学期期末数学试题(已下线)模块三 专题7 大题分类练(三角恒等变换)基础夯实练(北师大版)(已下线)模块三 专题5 大题分类练(三角恒等变换)基础夯实练(苏教版)
更新时间:2021-08-16 16:11:13
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【推荐2】如图,在平面直角坐标系xOy中,点
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