原式=sin75cos(180-75)-sin(180-75)sin(90-75)
=sin75(-cos75)-sin75cos75
=-sin75cos75-sin75cos75
=-2sin75cos75
=-sin150
=-1/2
sin75°cos105°-sin105°sin15°的值等于
sin75°cos105°-sin105°sin15°的值等于
其他人气：555 ℃时间：2020-03-19 21:17:42
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