-sinα+根号3cosα=
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-sinα+根号3cosα=-sinα+根号3cosα=-sinα+根号3cosα=-sinα+√3cosα=2(-1/2sinα+√3/2cosα)=2(cos120°sinα+sin120°cos
-sinα+根号3cosα=
-sinα+根号3cosα=
-sinα+根号3cosα=
-sinα+√3cosα
=2(-1/2 sinα+√3/2 cosα)
=2(cos120°sinα+sin120°cosα)
=2sin(α+120°)
2sin(a+120度)
-sina+√3cosa
=2[(-1/2)sina+(√3/2)cosa]
=2[sinacos(2π/3)+cosasin(2π/3)]
=2sin(a+2π/3)
-sinα+√3cosα
=√3cosα-sinα
=2(√3/2*cosα-1/2*sinα)
=2(sinπ/3cosα-cosπ/3sinα)
=2sin(π/3-α)
(√3cosa-sina)/(√3cosa+sina)=cos(a+π/6)/sin(a+π/6)=cot(a+π/6)