(2cos10°-sin20°)/cos20°=?

来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/11 11:30:52
(2cos10°-sin20°)/cos20°=?(2cos10°-sin20°)/cos20°=?(2cos10°-sin20°)/cos20°=?(2cos10°-sin20°)/cos20°=(

(2cos10°-sin20°)/cos20°=?
(2cos10°-sin20°)/cos20°=?

(2cos10°-sin20°)/cos20°=?
(2cos10°-sin20°)/cos20° =(2sin80°-sin20°)/cos20° =(2sin(60°+20°)-sin20°)/cos20° =(2(sin60°cos20°+cos60°sin20°)-sin20°)/cos20° =√3cos20°/cos20° =√3