已知
,且α是第________象限角.
从① 一,② 二,③ 三,④ 四,这四个选项中选择一个你认为恰当的选项填在上面的横线上,并根据你的选择,解答以下问题:
(1)求
的值;
(2)化简求值:
.
注:若选择多个条件分别解答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7fdccadfa7469825f8a5ccbf495c24.png)
从① 一,② 二,③ 三,④ 四,这四个选项中选择一个你认为恰当的选项填在上面的横线上,并根据你的选择,解答以下问题:
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
(2)化简求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a61e718de14108e2346f3f63c09c76.png)
注:若选择多个条件分别解答,则按第一个解答计分.
更新时间:2023-03-26 21:27:03
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解题方法
【推荐2】(1)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6104d6c8da0fe912b0aab5d1f9aba351.png)
①
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②
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(2)已知
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解答题-计算题
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【推荐1】已知
.
(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b60022a484666a6d5d6e8b1269bba54.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460f09e562917f6e54b8f6ae3779dca.png)
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【推荐2】已知向量
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(Ⅱ)求向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec82208ded0cc5c2f7ae811d520a3d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75fd120ae2e91fcea9b58344ef4afe31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afae43e56625133c18caea3b98b148e8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7195a0b5b59c9462b9faaf5a9fcfc6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(Ⅰ)求
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【推荐1】从以下三个条件中任选一个,补充在下面问题中,若问题中的三角形存在,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/071a7e733d466949ac935b4b8ee8d183.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60ac5588aca10a2c429e104049d1924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b3132d434668cab754f1540a7ae4b6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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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.
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【推荐2】已知在扇形
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