求值:[sin50°(1+tan10°√3)-cos20°]/[cos80°乘以根号下1-cos20°]
问题描述:
求值:[sin50°(1+tan10°√3)-cos20°]/[cos80°乘以根号下1-cos20°]
答
(sin50°(1+√3*tan10°)-cos20°)/(cos80°*√(1-cos20°))=(sin50°(1+√3*sin10°/cos10°)-cos20°)/(cos80°*√(1-cos20°))=(sin50°((cos10°+√3*sin10°)/cos10°)-cos20°)/(cos80°*√(2(si...