化简:sin15°*cos15°
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:2024/07/22 10:12:36
化简:sin15°*cos15°
![化简:sin15°*cos15°](/uploads/image/z/19724188-4-8.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9Asin15%C2%B0%2Acos15%C2%B0)
sin15°*cos15°
=(1/2)*2sin15°*cos15°
=(1/2)*sin(15°+15°)
=(1/2)*sin30°
=(1/2)*(1/2)
=1/4
=(1/2)*2sin15°*cos15°
=(1/2)*sin(15°+15°)
=(1/2)*sin30°
=(1/2)*(1/2)
=1/4
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