tan15度等于几分之几
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:2024/07/31 22:04:24
tan15度等于几分之几
![tan15度等于几分之几](/uploads/image/z/17114130-18-0.jpg?t=tan15%E5%BA%A6%E7%AD%89%E4%BA%8E%E5%87%A0%E5%88%86%E4%B9%8B%E5%87%A0)
tan15°
=tan(60°-45°)
=(tan60°- tan45°)/(1+ tan60°*tan45°)
=(根号3 -1)/(1+根号3)
=(根号3-1)*(根号3-1)/[(根号3+1)(根号3-1)]
=(4-2根号3)/2
=2-根号3
=tan(60°-45°)
=(tan60°- tan45°)/(1+ tan60°*tan45°)
=(根号3 -1)/(1+根号3)
=(根号3-1)*(根号3-1)/[(根号3+1)(根号3-1)]
=(4-2根号3)/2
=2-根号3