solution with two constants of integration. use bessel's equation

3. A liquid level dynamic in a horizontal tank is presented as dh(t) Fin(t) - kh(t) (1) dt (2/2rh(t) h2(t)) where h(t) is liquid level inside the tank, Fin is incoming flow rate, r is radius of the tank, L is the length of tank and k is the constant flowing out from the tank. (a) linearize the equation (b) Determine the transfer function from Fin(t) to h(t)