(2sin80º-cos70º)除以cos20º=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 17:52:48
![(2sin80º-cos70º)除以cos20º=?](/uploads/image/z/7218773-53-3.jpg?t=%282sin80%26%23186%3B%EF%BC%8Dcos70%26%23186%3B%29%E9%99%A4%E4%BB%A5cos20%26%23186%3B%3D%3F)
(2sin80º-cos70º)除以cos20º=?
(2sin80º-cos70º)除以cos20º=?
(2sin80º-cos70º)除以cos20º=?
(2sin80º-cos70º)除以cos20º=(2sin(60º+20º)-sin20º)/cos20º
=(根号3cos20º+sin20º-sin20º)/cos20º=根号3cos20º/cos20º
=根号3