sin45°sin15°+sin225°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:2024/07/05 12:36:52
sin45°sin15°+sin225°cos15°=
![sin45°sin15°+sin225°cos15°=](/uploads/image/z/20003877-45-7.jpg?t=sin45%C2%B0sin15%C2%B0%EF%BC%8Bsin225%C2%B0cos15%C2%B0%EF%BC%9D)
sin225°=sin(180°+45°)=-sin45°=-cos45°
sin45°*sin15°+sin225°*cos15°=sin45°*sin15°-cos45°*cos15°=-cos(45°+15°)=-cos60°=-0.5
sin45°*sin15°+sin225°*cos15°=sin45°*sin15°-cos45°*cos15°=-cos(45°+15°)=-cos60°=-0.5
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