Equations (6.4) and (1.6) have the same form except the variable t in Equation (1.6) is replaced by the variable x in Equation (6.4) and x has been replaced by f (x). Thus it follows that the general solution of Equation (6.4) is
Equations (6.4) and (1.6) have the same form except the variable t in Equation(1.6) is replaced by the variable x in Equation (6.4) and x has been replaced byf (x). Thus it follows that the general solution of Equation (6.4) is