求值(2sin80°-cos70°)÷cos20°
求值:(2sin80°-cos70°)/cos20°
求值:cos20°sin20°
数学函数化简题2cos10°-sin20°/cos20°=?sin40°+2cos70°/sin50°=?
求值[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80°)
求值:sin10°sin50°sin70°sin80°
求值:1/sin10°-根号3/sin80°
求值:1/sin10°-√3/sin80°
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
求值:[2sin50°+sin80°(1+√3tan10°)]/√2cos5°
求值:2sin50°+sin80°(1+3tan10°)1+cos10°
求值:[sin50°(1+tan10°√3)-cos20°]/[cos80°乘以根号下1-cos20°]
求值:【sin50°[1+根号(3)tan10°]—cos20°】/[cos80°根号(1—cos20°)】