化简:(1)1/2cosx-√3/2sinx(2)√3sinx+cosx(3)√2(sinx-cosx)(4)√2cosx-√6sinx
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解决时间 2021-02-26 10:10
- 提问者网友:临风不自傲
- 2021-02-26 02:27
化简:(1)1/2cosx-√3/2sinx(2)√3sinx+cosx(3)√2(sinx-cosx)(4)√2cosx-√6sinx
最佳答案
- 五星知识达人网友:梦中风几里
- 2021-02-26 03:36
1.1/2cosx-√3/2sinx
=cosπ/3cosx-sinπ/3sinx
=cos(x+π/3)
2.√3sinx+cosx
=2[(√3/2)sinx+(1/2)cosx]
=2(cosπ/6sinx+sinπ/6cosx)
=2sin(x-π/6)
3.√2(sinx-cosx)
=2[(√2/2)sinx-(√2/2)cosx]
=2(cosπ/4sinx-sinπ/4cosx)
=2sin(x-π/4)
4.√2cosx-√6sinx
=2√2[(1/2)cosx-(√3/2)sinx]
=2√2(cosπ/3cosx-sinπ/6sinx)
=2√2cos(x+π/3)
=cosπ/3cosx-sinπ/3sinx
=cos(x+π/3)
2.√3sinx+cosx
=2[(√3/2)sinx+(1/2)cosx]
=2(cosπ/6sinx+sinπ/6cosx)
=2sin(x-π/6)
3.√2(sinx-cosx)
=2[(√2/2)sinx-(√2/2)cosx]
=2(cosπ/4sinx-sinπ/4cosx)
=2sin(x-π/4)
4.√2cosx-√6sinx
=2√2[(1/2)cosx-(√3/2)sinx]
=2√2(cosπ/3cosx-sinπ/6sinx)
=2√2cos(x+π/3)
全部回答
- 1楼网友:廢物販賣機
- 2021-02-26 04:15
(1)1/2cosx-√3/2sinx
=sinπ/6 cosx-cosπ/6 sinx
=sin(π/6-x)
(2)√3sinx+cosx
=2(√3/2sinx+1/2 cosx)
=2(cosπ/6sinx+sinπ/6cosx)
=2sin(x+π/6)
(3)√2(sinx-cosx)
=2(√2/2sinx-√2/2cosx)
=2(cosπ/4 sinx-sinπ/4 cosx)
=2sin(x-π/4)
(4)√2cosx-√6sinx
=2√2(1/2 cosx-√3/2 sinx)
=2√2(sinπ/6 cosx-cosπ/6 sinx)
=2√2 sin(π/6-x)
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