题目内容
| 3-sin70° |
| 2-cos210° |
| 3-sin70° |
| 2-cos210° |
| 3-sin70° | ||
2-
|
| 2(3-sin70°) |
| 3-cos 20° |
| 2(3-cos20°) |
| 3-cos 20° |
故答案为：2
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相关题目
| 3-sin70° |
| 2-cos210° |
A、
| ||||
B、
| ||||
| C、2 | ||||
D、
|
故答案为：2
题目内容
| 3-sin70° |
| 2-cos210° |
| 3-sin70° |
| 2-cos210° |
| 3-sin70° | ||
2-
|
| 2(3-sin70°) |
| 3-cos 20° |
| 2(3-cos20°) |
| 3-cos 20° |
| 3-sin70° |
| 2-cos210° |
A、
| ||||
B、
| ||||
| C、2 | ||||
D、
|
②sin13°cos17°-cos13°sin17°=
③sin70°cos25°-cos65°sin20°=
④sin140°cos20°+sin50°sin20°= 