计算:cos15°−sin15°cos15°+sin15°
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:2024/07/09 15:57:28
计算:
cos15°−sin15° |
cos15°+sin15° |
![计算:cos15°−sin15°cos15°+sin15°](/uploads/image/z/19283269-13-9.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9Acos15%C2%B0%E2%88%92sin15%C2%B0cos15%C2%B0%2Bsin15%C2%B0)
cos15°−sin15°
cos15°+sin15°=
1−tan15°
1+tan15°=
tan45°−tan15°
1+tan45°tan15°=tan(45°-15°)=tan 30°=
3
3,
答案:
3
3.
cos15°+sin15°=
1−tan15°
1+tan15°=
tan45°−tan15°
1+tan45°tan15°=tan(45°-15°)=tan 30°=
3
3,
答案:
3
3.
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