在三角形ABC中AB=BC,以AB为直径的圆O交AC于D,过点D向DF垂直于BC交AB延长线于点E,垂足为F,DE是切线,若AB=5,AC=8,求cosE的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 05:02:45
![在三角形ABC中AB=BC,以AB为直径的圆O交AC于D,过点D向DF垂直于BC交AB延长线于点E,垂足为F,DE是切线,若AB=5,AC=8,求cosE的值](/uploads/image/z/3567980-20-0.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%ADAB%3DBC%2C%E4%BB%A5AB%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E5%9C%86O%E4%BA%A4AC%E4%BA%8ED%2C%E8%BF%87%E7%82%B9D%E5%90%91DF%E5%9E%82%E7%9B%B4%E4%BA%8EBC%E4%BA%A4AB%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%2C%E5%9E%82%E8%B6%B3%E4%B8%BAF%2CDE%E6%98%AF%E5%88%87%E7%BA%BF%2C%E8%8B%A5AB%3D5%2CAC%3D8%2C%E6%B1%82cosE%E7%9A%84%E5%80%BC)
xROPW4umܶbTXpA S4@F/ fH`HSm>_k
x&m=|lg}:ޣtuKquΗ:Kl{lտSUkpN` ,;=S HYݣMpF+)]"sT'
]rA64ZldyteLav&<>~$;d$G(|q$mH:Y*_p"zϏb]yfHj;VUK
X"R҂"Җkْdy'z-
KP-'>DnE,AAM)WDIyQ90˓o&,LzӜlR&QF@45>kz.&4XUk\>4 PuVpUFAYGH^rdaqÜjDa'5V^5IZq