cos2x+√3sin2x怎么等于2sin(2x+π/6)

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cos2x+√3sin2x怎么等于2sin(2x+π/6)cos2x+√3sin2x怎么等于2sin(2x+π/6)cos2x+√3sin2x怎么等于2sin(2x+π/6)全部展开收起cos2x+√

cos2x+√3sin2x怎么等于2sin(2x+π/6)
cos2x+√3sin2x怎么等于2sin(2x+π/6)

cos2x+√3sin2x怎么等于2sin(2x+π/6)

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cos2x+√3sin2x=2(1/2 cos2x+√3/2 sin2x)=2(sin π/6 cos2x+cosπ/6 sin2x)= 2sin(2x+π/6)