... )tsin(F)tsin(Fff++= 22 )/(cos)/tsin(FFfB 323 2 = +=)]()tsin[(Ff3 2 3 2 2)]()tsin[(Ff3 2 3 2 2+ )/(cos)/tsin(FFfC3434 = +=)]()tsin[(Ff3434 2 )]()tsin[(Ff3434 2 + ... qua: tsinIiA= 2 )/tsin(IiB 322 = )/tsin(IiC3 42 = Tổỡng pha sinh ra stõ : ==costsinFF ,,fA531 )/(cos)/tsin(FF ,,fB 323 2531== )/(cos)/tsin(FF ,,fB3434531== ... 2 42 2 2 ==sinFd.cosFFptptpt. Vaỡ tsinIWiWFptptpt== 2 2 2 1 Thay vaỡ ta õổồỹc: ==, ,,m.ptpttsin.cosFF531 trong õoù: ===ptptptm.ptIW,IWsinIWF...