sinπ/12-根号3cosπ/12的值
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解决时间 2021-01-25 03:42
- 提问者网友：心牵心
- 2021-01-24 21:26
sinπ/12-根号3cosπ/12的值
最佳答案
- 五星知识达人网友：拾荒鲤
- 2021-01-24 22:45
原式=2(sinπ/12*1/2-cosπ/12*√3/2)
=2(sinπ/2cosπ/3-cosπ/12sinπ/3)
=2sin(π/12-π/3)
=2sin(-π/4)
=-√2
=2(sinπ/2cosπ/3-cosπ/12sinπ/3)
=2sin(π/12-π/3)
=2sin(-π/4)
=-√2
全部回答
- 1楼网友：逃夭
- 2021-01-24 23:02
4)
=-2sin(π/3)-cos(π/12)cos(π/12)]
=2[sin(π/2)*sin(π/12-√3cosπ/3)
=2sin(-π/12 - π/12
=2[(1/12)sin(π/3)]
=2sin(π/12)-(√3/2)*cos(π/sinπ/
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