cos40°+sin50°(1+√3tan10°)=cos40°+sin50°(1+√3tan10°)
=cos40°+[sin50°/cos10°][cos10°+√3sin10°]
=cos40°+[2sin50°/cos10°][sin40°]
=cos40°+2sin50°sin40°/cos10°
=cos40°+sin100°/cos10°
=cos40°+1
=2cos^220°
分母:sin110°√(1+cos40°)
=cos20°√(1+2cos^220°-1)
=√2*cos^220°
2cos^220°/√2*cos^220°
=√2
√2