(Ⅰ)已知向量
,求
与
的夹角的余弦值;
(Ⅱ)已知角
终边上一点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f7c4577433bf7679a5bc7ef89b0d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
(Ⅱ)已知角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a0cc78c3e209937bd33da16b04044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83dcba27522169c5d01b2ffe1bd2fe4.png)
更新时间:2019-09-14 11:59:32
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
【推荐1】已知角
的终边经过点
,且
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6ba7179284f4e11b2e8b9bf9186b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f331c3d96c5812a620e326373747eb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9f739559d46c649b531e44fe45a974.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】求下列各三角函数值:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507f8aef902f5affb35c6089c265e4e1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04e9a0999d6265026811106e4137765.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86139c7c5d4c0d226c2f3b179228c04.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6042d9a159f4e537b383ef4b51a91b11.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5392ebb167af51653ea8e8f5f5a2d329.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】已知角α的终边经过点
,分别求角α,
,
的正弦函数值、余弦函数值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c111a7b669770a2cc28e403ade76169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c47fa0604ad268f6eb45d3ad9c9c675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d5d1dac32b2b62e28fcc24e92d0d00.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐1】已知向量
,
.
(1)当
时,求
的值;
(2)当
,
,求向量
与
的夹角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b6e99d71eaa7784dab1e3808a2ad4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbff190804a3eccc616544b912615daa.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a370e1692215cab16406ec5c7d2734de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304f8ab09c271ea593ccd79358ff2b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247e2b63649fc53b77f9e99ed972ad77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】设
是两个单位向量夹角为
,若
,
(1)求
;
(2)求
;
(3)求
与
夹角;
(4)求
在
的投影.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd246148371f6f825f94e68480190f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f963da8e72b39e2532d5270e3bdcbb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63740ffa63265af7c4a42a13c6fa6279.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dccf5af2912b02864d4c3981225fad8b.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(4)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
您最近一年使用:0次