2. Use the method of separation of variablesto find formulas for the solu tions to the following differential equations. In each case your formula should be expressed in terms of the input variable that is indicated (e.g., n part (a) it is t) a) dy/dt=1/y. b) dz/dz = 3/(z-2). e) dy/dz=z/y e) du/dv=u/(1-1) f) dv/dt =-V