解题方法
1 .
被称为“欧拉公式”,之后法国数学家棣莫弗发现了棣莫弗定理:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b58a6a143689e5ed2b3c688d45e251e.png)
,则我们可以简化复数乘法
.
(1)已知
,求
;
(2)已知O为坐标原点,
,且复数
在复平面上对应的点分别为
,点C在
上,且
,求
;
(3)利用欧拉公式可推出二倍角公式,过程如下:
,所以
.
类比上述过程,求出
.(将
表示成
的式子,将
表示成
的式子)(参考公式:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc0ab4d45a4bef21ba8ae793f2e76f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b58a6a143689e5ed2b3c688d45e251e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6a7030364178c2ef0f6ce638b3ebda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd10f0306210459baee301dd367ff59.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbe7c60d94b95c996840172915eb6069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6da4e6752d8c8a0705194f2b2f16ab5d.png)
(2)已知O为坐标原点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b08933abf71f9fcb7b284d0bbb5438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd98a41e273bf640e0d567365fd20077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d54eacd5cf71d799a3a9e73e929795b.png)
(3)利用欧拉公式可推出二倍角公式,过程如下:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b47c4f23b5bb2ef3865facaf628223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82564733fce91b617f1199dae622fbc.png)
类比上述过程,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4255fe1b4ac0018a1270e18a6ac9ab31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864590e14d56eac2957323152c6b4b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d6c547202109017a8fd210e12b32ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66db91bb3be9e2b6ad567774e3699758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee85d22b9fd3c1afea0688617132365.png)
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名校
2 . 下列说法正确的是( )
A.在![]() ![]() ![]() |
B.在![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() |
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解题方法
3 . 下列命题正确的是( )
A.任意向量![]() ![]() |
B.任意复数![]() ![]() |
C.任意向量![]() ![]() |
D.任意复数![]() ![]() |
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4 . 已知平面直角坐标系xOy中向量的旋转和复数有关,对于任意向量
=(a,b),对应复数z=a+ib,向量x逆时针旋转一个角度
,得到复数
,于是对应向量
.这就是向量的旋转公式.根据此公式,已知正三角形ABC的两个顶点坐标是A(1,2),B(3,4),则C的坐标是___________ .(任写一个即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f0587b8f8862dd69b3fc469d4e283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d49e303f43057d7eb1e62bca046da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789dfd9a78a54765c819827def45e6aa.png)
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