求值:(3/sin^2140°-1/cos^2140°)*1/2sin10°
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/06 00:55:13
求值:(3/sin^2140°-1/cos^2140°)*1/2sin10°
^2表示平方,*是乘号
^2表示平方,*是乘号
(3/sin^2140°-1/cos^2140°)*1/2sin10°
=(3cos^2140-sin^2140)*0.5sin10/(sin^2140cos^2140)
=8(√3/2cos140-1/2sin140)(√3/2cos140+1/2sin140)/sin^2280
= -8sin80sin200/sin^2280
= -8sin80*sin160/sin^280
= -16sin^280*cos80/sin^280
= -16cos80
=(3cos^2140-sin^2140)*0.5sin10/(sin^2140cos^2140)
=8(√3/2cos140-1/2sin140)(√3/2cos140+1/2sin140)/sin^2280
= -8sin80sin200/sin^2280
= -8sin80*sin160/sin^280
= -16sin^280*cos80/sin^280
= -16cos80
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
(3/sin平方40°-1/cos平方140°)×1/2sin10°=16求证
求值:1/sin10°-根号3/sin80°
求值:1/sin10°-√3/sin80°
求值,根号下1-2sin10°cos10°/cos10°-根号下1-sin^2100°
1.求值sin 50°(1+√3 tan10°)2.求值1/sin10° -√3 /cos10°3.(tan20°+ta
化简1−2sin10°cos10°sin10°−1−sin
不查表求值sin²10°+cos²40°+sin10°cos40° 请有具体的解题过程,
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
求值:1−2sin10
〔cos40°(cos10°+根号3sin10°)〕/ (2cos^25°-1)
化简:(根号1-2sin10°×cos10°)比sin10°-根号1-sin^210°