设向量a=(sin15°,cos15°),b=(cos15°,.sin15°),则ab夹角为谢谢了,
设向量a=(cos75度,sin75度),b(cos15度,sin15度)那么|a-b|的值为A 1/2 B √2/2
求cos15°-tan15°/cos15°+sin15°
cos75°cos15°+sin75°sin15°的值为( )
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
cos15°sin9°+sin6°/sin15°sin9°—cos6°=
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
(cos15°-cos75°)(sin75°+sin15°)=?
tan15°+cos15°/sin15°的值 求详解
求sin15°+tan30°cos15°的值
根号6倍的sin15°+根号2倍的cos15°=什么
求(sin8°+sin7°cos15°)/(cos8°-sin7°sin15°)的值
关于三角函数的计算题(sin8°+sin7°cos15°)÷(cos8°-sin7°sin15°)=?