2sin50°(1+根号3tan10°)=?
问题描述：
2sin50°(1+根号3tan10°)=?
答
2sin50°(1+√3tan10°)=2sin50(tan60-tan10)/tan(60-10)=2cos50(sin60/cos60-sin10/cos10)=2cos50(sin60cos10-cos60sin10)/(cos60*cos10)=2cos50sin(60-10)/(cos60*cos10)=sin100/(cos60*cos10)=sin80/(cos60*sin80...