sin50°分之一+cos50°分之根号三等于多少、用二倍角.
问题描述：
sin50°分之一+cos50°分之根号三等于多少、
用二倍角.
答
1/sin50+√3/cos50 =(cos50+√3sin50)/(sin50cos50) =2*sin(30+50)/(sin100/2) =4sin80/sin100 =4
答
1/sin50°+√3/cos50°=（cos50°+√3sin50°）/sin50°*cos50° =4（1/2cos50°+√3sin50°）/2sin50°*cos50° =4sin（50°+30°）/sin100° =4sin80°/sin80° =4