化简求值;(1-sin80°)/cos80°

来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/31 07:59:43
化简求值;(1-sin80°)/cos80°化简求值;(1-sin80°)/cos80°化简求值;(1-sin80°)/cos80°1-sin80°)/cos80°=(1-sin2*40°)/(cos

化简求值;(1-sin80°)/cos80°
化简求值;(1-sin80°)/cos80°

化简求值;(1-sin80°)/cos80°
1-sin80°)/cos80°
=(1-sin2*40°)/(cos2*40°)
=(1-2sin40°cos40°)/(2cos240°-1)
=(sin240°+cos240°-2sin40°cos40°)/(2cos240°-sin240°-cos240°)
=(cos40°-sin40°)2/(cos240°-sin240°)
=(cos40°-sin40°)2/(cos40°-sin40°)(cos40°+sin40°)
=(cos40°-sin40°)/(cos40°+sin40°)