∆>0=>y=c1er1t+c2er2t r1=-b-∆2ar2=-b+∆2a
∆=0=>y=c1t+c2er1t
∆<0=>y=eαtc1cosβt+c2sinβt α=-b2a β=-∆2a
∂P∂Y=∂Q∂T F=Pdt, ∂F∂y=Q; ∂F∂y=∂P∂∂y
pawelzaq