Y=cos2X-2√3sinxcosx化简
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Y=cos2X-2√3sinxcosx化简Y=cos2X-2√3sinxcosx化简Y=cos2X-2√3sinxcosx化简y=cos2x-2√3sinxcosx=cos2x-√3(2sinxcos
Y=cos2X-2√3sinxcosx化简
Y=cos2X-2√3sinxcosx化简
Y=cos2X-2√3sinxcosx化简
y=cos2x-2√3sinxcosx
=cos2x-√3(2sinxcosx)
=cos2x-√3sin2x
=2(1/2*cos2x-√3/2*sin2x)
=cos2xcosπ/3-sin2xsinπ/3
=cos(2x+π/3)
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