化简sin15°-cos15°/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:2024/08/19 17:15:04
化简sin15°-cos15°/sin15°+cos15°
![化简sin15°-cos15°/sin15°+cos15°](/uploads/image/z/19205627-59-7.jpg?t=%E5%8C%96%E7%AE%80sin15%C2%B0-cos15%C2%B0%2Fsin15%C2%B0%2Bcos15%C2%B0)
sin15°-cos15°/sin15°+cos15°
=tan15°-1 / tan15°+1
=tan15°-tan45° / tan15°+1
=tan(15°-45°)
=-tan30°
=-√3/3
=tan15°-1 / tan15°+1
=tan15°-tan45° / tan15°+1
=tan(15°-45°)
=-tan30°
=-√3/3
求cos15°-tan15°/cos15°+sin15°
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