1 . 意大利画家列奥纳多·达·芬奇(1452.4—1519.5)的画作《抱银貂的女人》中,女士脖颈上黑色珍珠项链与主人相互映衬呈现出不一样的美与光泽,达·芬奇提出:固定项链的两端,使其在重力的作用下自然下垂,项链所形成的曲线是什么﹖这就是著名的“悬链线问题”,后人给出了悬链线的函数解析式:
,其中
为悬链线系数,
称为双曲余弦函数,其函数表达式为
,相应地双曲正弦函数的达式为
.若直线
与双曲余弦函数
与双曲正弦函数
的图象分别相交于点
,
,曲线
在点
处的切线
与曲线
在点
处的切线
相交于点
,则
是_________ (选填偶函数或奇函数),若
是以
为直角顶点的直角三角形,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50104466915a4a2a4adc8a915e7d0058.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1392aa2eb76daff9047a0c6a3c077ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0d713cb8d99fe07395c8536ee3b10b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/2021/4/20/2703940576870400/2786954261446656/STEM/d750c76f-7dc9-4594-abcf-3b802fa78484.png?resizew=106)
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