Separability Differential equations (a), (b), and (c) are separa- ble. Equation (d) is not separable: it resists all efforts to segregate its variables. (What goes wrong when you try to separate part (d)?) dy (a) dt + ydy = -t dt y dy = 1'y dy = 1²dt y (b) ip dy (c) = y +1 dt dy = dt y +1 dy (d) =t + y (not separable) ip

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