SIN2X怎样化成f(x)=Asin(wx+φ)

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SIN2X怎样化成f(x)=Asin(wx+φ)SIN2X怎样化成f(x)=Asin(wx+φ)SIN2X怎样化成f(x)=Asin(wx+φ)2cos^2(xπ/6)√3sin2x=1cos(2xπ

SIN2X怎样化成f(x)=Asin(wx+φ)
SIN2X怎样化成f(x)=Asin(wx+φ)

SIN2X怎样化成f(x)=Asin(wx+φ)
2cos^2(x π/6) √3sin2x=1 cos(2x π/3) √3sin2x
=1 cos2xcosπ/3-sin2xsinπ/3 √3sin2x
=1 (1/2)cos2x (√3/2)sin2x
=sin(2x π/6) 1