(2sin10°+sin50°)÷cos50°
2sin50°cos50°怎么等于cos50°cos40°+sin50°sin40°
计算1sin50°+3cos50°
计算 sin10°^2 + sin50°^2 + sin10°sin50° 的值? 答案:3/4
计算sin50°cos40°+cos50°sin40°
sin50°*cos40°+cos50°*sin40°
sin50°=a cos40°=?cos50°?
求值:2sin50°+cos10°*(1+根号3tan10°)/cs35°cos40°+cos50°cos55°
sin10°sin50°为什么等于1/2(cos40-cos60)
[2sin50°+sin10°(1+根号3tan10°)]乘sin10°等于?
sin10°sin50°-sin50°sin70°-sin70°sin10°=?
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
化简:[2sin50°+sin10°(1+根号3*tan10°)]*根号sin^280°