求值:1/sin10°-√3/sin80°
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/23 11:23:52
求值:1/sin10°-√3/sin80°
求值:1/sin10°-√3/sin80°
求值:1/sin10°-√3/sin80°
原式= 1 /sin 10°-√3 /cos 10°
= (cos 10°-√3 sin 10°) / (sin 10°cos 10°)
= 4 [ (1/2) cos 10°-(√3/2) sin 10°] / (2 sin 10°cos 10°)
= 4 (sin 30°cos 10°-cos 30°sin 10°) / sin 20°
= 4 sin 20°/ sin 20°
= 4.
= = = = = = = = =
非特殊角的问题,尽量化为0°到45°之间.
对 cos 10°-√3 sin 10°,也可直接用辅助角公式,但正负有点麻烦.
(详见百度)
求值:1/sin10°-√3/sin80°
求值:1/sin10°-根号3/sin80°
求值[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80°)
1/sin10°-√3/sin80°
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
1/sin10°— √3/sin80°
[2sin50°+sin10°(1+√3tan10°)]*√2(sin80°)*(sin80度)
求值:sin10°sin50°sin70°sin80°
(2cos20°-sin10°)/sin80°化简求值
求值【2sin50+sin10(1+根号3*tan10)]*根号下2*sin80,
1/sin10°-根号3/sin80°的值为
1/sin10°-根号3/sin80°的值为
1/sin10°-根号3/sin80°=
求[2sin50°+sin10°(1+√3tan10°0]sin80°的值
1/sin10°-√3/sin80°=______________我用计算机算出来是4
求值;1/sin10°-√3/cos10°.
求值.1/sin10°-√3/cos10°
求值:sin10°(1+√3cot20°)