sin165度乘以cos15度结果

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/20 03:05:12
sin165度乘以cos15度结果sin165度乘以cos15度结果sin165度乘以cos15度结果sin165度×cos15度=sin15×cos15=1/22sin15cos15=1/2sin3

sin165度乘以cos15度结果
sin165度乘以cos15度结果

sin165度乘以cos15度结果
sin165度×cos15度
=sin15×cos15
=1/2 2sin15cos15
=1/2 sin30
=1/2 ×1/2
=1/4

sin165cos15
=sin(180-15)cos15
=sin15cos15
=sin30/2
=(1/2)/2
=1/4

sin165°×cos15°=sin15°×cos15°=sin30°/2=1/4