y=2cos(2x+π/3)+1 =2cos2xcosπ/3-2sin2xsinπ/3+1 =cos2x-√3sin2
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/06 11:29:27
y=2cos(2x+π/3)+1 =2cos2xcosπ/3-2sin2xsinπ/3+1 =cos2x-√3sin2 接下去怎么化简
y = 2 cos ( 2x + π/3 ) + 1
= 2 cos2x cosπ/3 - 2 sin2x sinπ/3 + 1
= cos2x - √3 sin2x + 1
= 2cos²x - 1 - 2√3 sinx cosx +1
= cosx ( 2 cosx - 2√3 sinx )
= 4cosx ( 1/2 cosx - √3/2 sinx )
= 4cosx cos( x + π/3 )
= 2 cos2x cosπ/3 - 2 sin2x sinπ/3 + 1
= cos2x - √3 sin2x + 1
= 2cos²x - 1 - 2√3 sinx cosx +1
= cosx ( 2 cosx - 2√3 sinx )
= 4cosx ( 1/2 cosx - √3/2 sinx )
= 4cosx cos( x + π/3 )
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f(x)=1/2 sin2xsinφ+cos^2xcosφ-1/2sin(π/2+φ),其中φ = π/3 .
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