三角函数公式在求值、化简、证明中起着非常重要的作用,如可以用含
的式子来表示
的任意三角数,如
,可见
也可以表示为只含
的表达式.以上推理过程体现了数学中的逻辑推理和数学运算等核心素养,同时也蕴含了转化和换元思想.
(1)试用以上素养和思想方法将
表示为只含
的代数式;
(2)已知
,利用以上结论求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267572d2dff2dc38cf9251b7f33a3e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4227d463b9a3c9c371e62176868476cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a080cab44a7d3605430d67b207f9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
(1)试用以上素养和思想方法将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5ff5a2e7663e6a21ccea3149a10113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44195745e40b014d886e28c21ccc316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7b915277169254e670ea51b693b9fc.png)
23-24高二下·陕西商洛·期中 查看更多[2]
更新时间:2024-06-07 16:42:33
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【推荐1】在①
,②
这两个条件中任选一个,补充到下面的问题中,并解答.
已知角a是第一象限角,且___________.
(1)求
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注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d83739b01d473fb2465102161b44de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f04fa83dcbd4d54db2c8885fbeef00.png)
已知角a是第一象限角,且___________.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1178341bce0f43c887060fe4747b20.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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【推荐2】已知
,
(Ⅰ)求
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(Ⅱ)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6012faea6eff38fbe3f5bab891381da6.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa993ed32373393d9c64586bd87e4d99.png)
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【推荐1】计算:
(1)已知
是第二象限角,
,求
,
的值;
(2)已知
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(3)已知
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(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d15b377e37c9e0fcbfce046148bdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bf5fbc765a9042c14139cf4d882e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777dcf6506a2a453823cddf0bd903962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4338d266fb5457a048ff6e9f92cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae213fddd38dcb0c167eaa136d49ce1.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8556ee1d0650eb6a7c0b37bc4f8fedd1.png)
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【推荐1】在
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(1)证明:
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09d11c5f372f719629e9a5bafdbe6cf.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b850b6c714abe0d117eae47783230b0.png)
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解答题-计算题
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【推荐2】求下列各式的值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f7befc8600a844ed750b40a43e8a4a.png)
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【推荐3】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d3dad095027475b0d53fb7f4e7cfa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5c9dd749202f50f605cc804bedbe1f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c5a05a11f731194a845e68a0479ce4.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14f0e92fa8665fb14d8843981319715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ba9745c01bcc7c3b62a4ee6dd60a3a.png)
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