1 . 计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f745726feeda844e8121ade9663ff2.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f745726feeda844e8121ade9663ff2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d4e63072254577c797c52fe15323c0.png)
您最近一年使用:0次
名校
解题方法
2 . 完成下列两个运算:
(1)计算sin600°+cos750°的值.
(2)化简
(1)计算sin600°+cos750°的值.
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9360dfe9da8e933e5703b1624c130bef.png)
您最近一年使用:0次
解题方法
3 . 如图,质点A受到力
和
的作用,已知
,
与正东北方向的夹角为30°;
,
与正东方向的夹角为60°,求下列两个向量的大小和方向:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ca886d68-c6da-43a1-8d58-a9cc967af765.png?resizew=210)
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9982d436c304ef72a26a784126810597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f4134d9921c53f83c6bde981e8545c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2711f8b26740d8877414a24151ac5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9982d436c304ef72a26a784126810597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2711f8b26740d8877414a24151ac5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f4134d9921c53f83c6bde981e8545c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ca886d68-c6da-43a1-8d58-a9cc967af765.png?resizew=210)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826654067a30d3bdbf15629d3005e1e8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0b520f1891aa993c04c109032c19c9.png)
您最近一年使用:0次