已知
为第二象限角,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8275a1f463fd84841111ab3717faa0d9.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c9121cede0ee0562e23b8a26b34616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadf44d6521c6d84b08253616329cc72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8275a1f463fd84841111ab3717faa0d9.png)
更新时间:2022-10-24 16:40:05
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名校
【推荐1】已知
中的内角
满足
,则角
可表示为______ (限定用反三角符号
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c106915873fcb8d6b21c7fa80d393ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f5f59b2d27a6cc1516195eb6711b0f.png)
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【推荐2】已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d292bf76cce13b6557add93f6661329.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf15517c340a314ac13195b41ed7614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d49ec515fb1fdc93ca4dda443326ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d292bf76cce13b6557add93f6661329.png)
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【推荐1】判断正误(正确的填写“正确”,错误的填写“错误”)
(1)两角和与差的正弦、余弦公式中的角α,β是任意的.( )
(2)存在
,使得
成立.( )
(3)对于任意
,
都不成立.( )
(4)
.( )
(1)两角和与差的正弦、余弦公式中的角α,β是任意的.
(2)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7170baf4e8fc6bf3dd518cc49bf736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b839269b506f3abcf4458ecd3a8cfd.png)
(3)对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7170baf4e8fc6bf3dd518cc49bf736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649c3008c4545c195e0f279606f881c9.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75124fba8b95791947cf8eff99a84630.png)
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解题方法
【推荐2】已知
,
,且
、
是同一象限的角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dc4a8ca221732931bb72442a15df14.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88fd7361500cc27a71d40a0a7d835a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b530b6c751e94f4c86c2ca74c047bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dc4a8ca221732931bb72442a15df14.png)
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