1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
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1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
1.√3cosa+sina
=2(√3/2•cosa+1/2•sina)
=2[sin(π/3)•cosa+cos(π/3)•sina]
=2sin(π/3+a)
或：√3cosa+sina
=2(√3/2•cosa+1/2•sina)
=2[cos(π/6)•cosa+sin(π/6)•sina]
=2cos(π/6-a)
2.-sina+√3cosa
=√3cosa-sina
=2(√3/2•cosa-1/2•sina)
=2[sin(π/3)•cosa-cos(π/3)•sina]
=2sin(π/3-a)
或：-sina+√3cosa
=√3cosa-sina
=2(√3/2•cosa-1/2•sina)
=2[cos(π/6)•cosa-sin(π/6)•sina]
=2cos(π/6+a)
3.cosa-√3•sina
=2(1/2•cosa-√3/2•sina)
=2[cos(π/3)•cosa-sin(π/3)•sina]
=2 cos(π/3+a)
或cosa-√3•sina
=2(1/2•cosa-√3/2•sina)
=2[sin(π/6)•cosa-cos(π/6)•sina]
=2sin(π/6-a)
1.根号3cosa+sina＝2（根号3/2*cosa+1/2*sina)=2sin(a+兀/3）
2.-sina+根号3cosa ＝2（根号3/2*cosa-1/2*sina）＝2sin（兀/3-a）
3.cosa-根号sina 少数没？不晓得了