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

1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina cosa+根号3sina= sinA+cosA=根号2/3,求sin2A/(sinA-cosA) 已知sina+cosa=根号3/2 求sina-cosa 化简 (根号1-cosa+根号1+cosa)(根号1-cosa+根号1+cosa) /(根号1-cosa-根号1+cosa) +根号1+sina/根号1-sina 3π/2 sina+cosa=根号3/3(0 cosA-根号3sinA 如何化简 化简：sina+_（根号3)cosa sinA=根号3,COSA=? cosa-根号3sina可化为（ ） 化简sina-根号3cosa= 化简 1/2sina+根号3/2cosa 根号2/2sina-根号2/2cosa 已知tana=3,求下列各式的值 1.sina+cosa/sina-cosa 2.sina.cosa 3.sin^2 a+sina.cosa sina/2+cosa/2=根号3/,且cosa 若cos2a/sin(a-π/4)=-根号2/2 求：1.cosa+sina；2.cosa-sina; 3.tana (sina-1)/根号(3-2sina-2cosa)值域 2sinA^2+1/2cosA+根号3/2sinA 化简 (根号1-cosa+根号1+cosa)/(根号1-cosa-根号1+cosa) +根号1+sina/根号1-sina 3π/2