题目内容
cos80°cos35°+cos10°cos55°=______.
∵cos80°cos35°+cos10°cos55°
=cos80°cos35°+sin80°sin35°
=cos(80°-35°)
=cos45°=
.
故答案为:
.
=cos80°cos35°+sin80°sin35°
=cos(80°-35°)
=cos45°=
| ||
| 2 |
故答案为:
| ||
| 2 |
练习册系列答案
相关题目
题目内容
| ||
| 2 |
| ||
| 2 |