求sin15°+cos165°的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/04 04:05:19
求sin15°+cos165°的值
求sin15°+cos165°的值
求sin15°+cos165°的值
原式= sin 15° +cos (180° -15°)
= sin 15° -cos 15°
= (根号2) [ (根号2)/2 *sin 15° - (根号2)/2 *cos 15° ]
= (根号2) ( sin 15° cos 45° -cos 15° sin 45°)
= (根号2) sin (-30°)
= - (根号2) sin 30°
= - (根号2) /2.
= = = = = = = = =
已用计算器验证.
求sin15°+cos165°的值
sin15°*cos165°= 求解答
sin15°+cos165°=
sin15度cos165度的值是?
sin15度cos165度的值是?
cos165°的值是多少?
cos165°的三角函数值
sin15°cos75°+cos165°sin75°
用加法定理,求下列三角函数值 cos165°
求sin15°×sin75°的值
求sin15°+cos15°的值
求cos165度的三角函数值?
cos165°=
求(sin15°-cos15°)/(sin15°+cos15°)的值
sin15°-cos15°/sin15°+cos15°的值?
sin15°-cos15°/sin15°+cos15°的值?
sin15和sin15°的区别
tan15°+cos15°/sin15°的值 求详解