求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
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求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^210°)求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^210°)求值:[2sin50°+
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
1-sin²10=cos²10
所以原式=(2sin50+sin10+√3sin10*sin10/cos10)*cos10
=2sin50cos10+sin10cos10+√3sin²10
=2sin50cos10+1/2*sin20+√3(1-cos20)/2
=2sin50cos10+1/2*sin20-√3/2cos20+√3/2
=2sin50cos10+sin20cos60-cos20sin60+√3/2
=2sin50cos10+sin(20-60)+√3/2
=2sin50cos10-sin40+√3/2
=2sin50cos10-sin(50-10)+√3/2
=2sin50cos10-sin50cos10+cos50sin10+√3/2
=sin50cos10+cos50sin10+√3/2
=sin(50+10)+√3/2
=sin60+√3/2
=√3
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
求值:【2sin50°+sin10°(1+根号3tan10°)】根号2sin280°
求值sin10°sin30°sin50°sin70°
求值:sin10°sin50°sin70°sin80°
求值:sin10°sin50°·sin70°
sin10°sin50°sin70° 怎样化简求值?
求值[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80°)
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
sin10°sin50°为什么等于1/2(cos40-cos60)
[2sin50°+sin10°(1+根号3tan10°)]乘sin10°等于?
Sin10°cos60°sin50°cos20°sin90°不查表求值
求值【2sin50+sin10(1+根号3*tan10)]*根号下2*sin80,
2sin50°+2sin10°sin40°/cos10°
化简:2sin50°+sin10°/cos10°
化简(2sin50°+sin10°)/cos10°
(2sin10°+sin50°)÷cos50°
化简[2sin50°+sin10°(1+√3tan10°)] √(2sin280°)
[2sin50°+sin10°(1+√3tan10°)]•√(sin²80°)