y=4cos2x+4根号3sinxcosx-2
=4cos2x+2根号3sin2x-2
=2根号7sin(2x+α)-2
其中α=arctan2根号3/3
∵函数Asin(x+α)的最小正周期是2π
∴函数Asin(2x+α)的最小正周期是π
即有函数y=4cos2x+4根号3sinxcosx-2(x∈R)的最小正周期是π
y=4cos2x+4根号3sinxcosx-2
=4cos2x+2根号3sin2x-2
=2根号7sin(2x+α)-2
其中α=arctan2根号3/3
∵函数Asin(x+α)的最小正周期是2π
∴函数Asin(2x+α)的最小正周期是π
即有函数y=4cos2x+4根号3sinxcosx-2(x∈R)的最小正周期是π