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sin 1 , sin 2 , sin 3 按从小到大排列的顺序为_______________.

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sin 2α+cos2α=1  sin 2α-cos2α=1  sin 2α+cos2α=-1  sin 2α-cos2α=-1  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0.2),2)  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0/2),2)  
sin 2α= 2sin α cos α  sin 2α= cos2α-sin 2α  sin 2α= 21(1+ cos2 α)  sin 2α= 21(1- cos2 α)  
i1=I1sinωt,i2=I2sin(3ωt+60°),求i1+i2  u1=U1sin(ωt+45°),u2=U2sin(ωt-45°),求u1-u2  i1=I1sin(ωt+30°),i1=I2sin(3ωt-30°),求i1-i2  以上三式均可  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0.2),2)  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0/2),2)  
0.5*SIN(1/2)*2  SIN(0.5)**2/2  0.5(SIN(1/2))**2  (SIN**2)(1/2)/2  
分析法  反证法  综合法  间接证明法  
sin2 α= 2sin α? cos α  sin2 α= 21(1- cos2 α)  sin2 α= 21(1+ cos2 α)  sin2 α= 21sin αcosα  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0/2),2)  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0/2),2)  
1/3*sin(1/2)*sin(1/2)  sin(0.5)*sin(0.5)/3  pow(sin(0.5),2)/3  1/3.0*pow(sin(1.0/2),2)  
sin 2 =± 2cos 1  sin 2 = ± 2cos 1  sin 2 =± 2sin 1  sin 2 = ± 2sin 1  
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