问题标题：
arccosx=5π/6,则arctan(2x/3)
问题描述：
arccosx=5π/6,则arctan(2x/3)
翟庆林回答：
cos5π/6=-cosπ/6=-根号3/2
arccosx=5π/6
X=-根号3/2
arctan(2x/3)
=arctan(-根号3/2*2/3)
=arctan(-根号3/3)
tan5π/6=-根号3/3
arctan(2x/3)=5π/6
点击显示
数学推荐
热门数学推荐