题目内容
计算
+
=______．
| 1 |
| sin50° |
| ||
| cos50° |
| 1 |
| sin50° |
| ||
| cos50° |
=
cos50°+
| ||
| sin50°cos50° |
=
2(
| ||||||
| sin50°cos50° |
=
| 2(sin30°cos50°+ cos30°sin50°) |
| sin50°cos50° |
=
| 2sin(30°+50°) |
| sin50°cos50° |
| 2sin80° |
| sin50°cos50° |
=
| 2sin80° | ||
|
=
| 2sin80° | ||
|
=4
故答案为4
练习册系列答案
全能测控一本好卷系列答案
相关题目