(sin10°+cos50°)/(cos10°-sin50°)?
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/15 10:52:37
(sin10°+cos50°)/(cos10°-sin50°)?
(sin10°+cos50°)/(cos10°-sin50°)?
(sin10°+cos50°)/(cos10°-sin50°)?
sin10°+cos50°
=sin10°+sin40°
=2sin25cos15
cos10°-sin50
=sin80-sin50
=2cos65sin15
=2sin25sin15
(sin10°+cos50°)/(cos10°-sin50°)
=2sin25cos15/2sin25sin15
=ctg15
=1/tan15
=1/tg(45-30)
=(1+tan45tan30)/(tan45-tan30)
=2+√3
(sin10°+cos50°)/(cos10°-sin50°)?
sin10°cos50°+sin50°cos10°
sin10°cos50°+sin50°cos10°
(2sin10°+sin50°)÷cos50°
求值 (cos10°+根号3sin10°)/cos50°
(2cos50°+sin20°)/(2sin10°+√3*sin20°)求值
(cos10°-cos50°)÷(sin10°-sin50°)
sin10°cos50°+sin50°cos10°的三角函数值
和角公式 sin50°cos10°+cos50°sin10°
求2cos50°-根号3sin10°/cos10°的值
【高一数学】求2cos50°-根号3sin10/cos10°=?
sin^220°+cos^250°+sin20°cos50°
用两角的和差公式求值 1.cos²105°-sin²105° 2.sin20°sin10°-cos10°sin70°3.½cosα+√3/2 sinα 4.√2cosα-√2sinα 5.sinα+cosα 6.sin200°sin310°+cos340°cos50°
三角函数化简,解释一下这两步怎么来的.=[(sin80°-sin20°)-sin20°]/2sin10° =(2cos50°sin30°-sin20°)/2sin10° ▲=(sin40°-sin20°)/2sin10° =2cos30°sin10°/2sin10° ▲=cos30° =√3/2
【求解释】(tan10°-根号3)cos50°=-1原式 = cos50°×(tan10°-tan60°) = cos50°×(sin10°cos60°-sin60°cos10°)/cos10°cos60° = cos50°×-sin(50°)/cos10°cos60° (此部以下求解释、算的对么、sin100°咋来的、最后怎么又
sin10加sin50除以cos10加cos50
((sin80°-sin20°)-sin20°)/2sin10° =(2cos50°sin30°-sin20°)/2sin10°怎么就从上面的式子转到下面了?
√(cos50°-sin50°)²+|cos50°-1|