解题方法
1 . 如图,沈阳东塔桥是沈阳唯一一座“双塔钢结构自锚式悬索桥”,悬索的形状是平面几何中的悬链线,悬链线方程为
(
为参数,
),当
时,该方程就是双曲余弦函数
,类似的有双曲正弦函数
.
;
(2)当
时,求
的最小值
;
(3)设
,证明:
有唯一的正零点
,并比较
和
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcee592f27561a08c5382ae859f1895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7ca7aa39924a7b0e9553eb841cadd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174887c6a781255eb8eda6f5c92c438e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd11c9bd4cb5ac688ea801dec1b0153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a59cab56922cffd14358d2f48d1e00.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fc54e432fbe61c86401a76b4f1fe8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50eeae6b06ff0f6cb7caabefdee109f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb708adff55a5bda517c3f570f06584c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7598b54c2ae46e8d8397ad3ef12e4b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c5690823d3da4dfdb815576ca0a5d4.png)
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