sin12分之π乘cos12分之5π
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解决时间 2021-02-07 11:42
- 提问者网友：你挡着我发光了
- 2021-02-07 02:34
sin12分之π乘cos12分之5π
最佳答案
- 五星知识达人网友：过活
- 2021-02-07 02:59
sin(π/12).cos(5π/12)
=cos(5π/12).cos(5π/12)
=(1/2) [1+ cos(10π/12) ]
=(1/2) [1- cos(π/6) ]
=(1/2) [1- √3/2 ]
=(2-√3)/4
=cos(5π/12).cos(5π/12)
=(1/2) [1+ cos(10π/12) ]
=(1/2) [1- cos(π/6) ]
=(1/2) [1- √3/2 ]
=(2-√3)/4
全部回答
- 1楼网友：怀裏藏嬌
- 2021-02-07 04:40
（cos12分之派-sin12分之派）（cos12分之派+sin12分之派）
=(cos12分之派)平方-(sin12分之派)平方
=cos6分之派=(√3)/2
- 2楼网友：千夜
- 2021-02-07 03:50
=sinπ/12sin(π/2-5π/12)
=sin²π/12
=(1-cos30º)/2
=(1-√3/2)/2
=(2-√3)/4
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