2cos5°−sin25°cos25°的值为 _.

问题描述:

2cos5°−sin25°
cos25°
的值为 ______.

原式=

2cos5°−sin25°
cos25°
=
2cos(30°−25°)−sin25°
cos25°
=
3
cos25°
cos25°
=
3

故答案为:
3