tanπ/12的具体数值,
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/29 15:32:34
tanπ/12的具体数值,
![tanπ/12的具体数值,](/uploads/image/z/19765498-58-8.jpg?t=tan%CF%80%2F12%E7%9A%84%E5%85%B7%E4%BD%93%E6%95%B0%E5%80%BC%2C)
tanπ/12
=tan30
=根号3/3
再问: tanπ/12=tan15
再答: ? 什么意思?
再问: tanπ/12等于tan15,你回答的tan30=根号3/3
再答: cos30 °= √¯3/2 cos15 °= √¯[(1 + cos30° )/2] sin15° = √¯[(1 - cos30° )/2] tan15° = sin15° /cos15° = √¯[(1 - cos30° )/(1 + cos30° )] = √¯[(2 - √¯3)/(2 + √¯3)] = (2 - √¯3)
=tan30
=根号3/3
再问: tanπ/12=tan15
再答: ? 什么意思?
再问: tanπ/12等于tan15,你回答的tan30=根号3/3
再答: cos30 °= √¯3/2 cos15 °= √¯[(1 + cos30° )/2] sin15° = √¯[(1 - cos30° )/2] tan15° = sin15° /cos15° = √¯[(1 - cos30° )/(1 + cos30° )] = √¯[(2 - √¯3)/(2 + √¯3)] = (2 - √¯3)