So far we have changed only the dependent variable. It is also possible to change the independent variable to obtain a new equation. This is analogous to changing the way we measure time. Consider the differential equation
This differential equation could be solved using an integrating factor, but we will use a change of variables. Suppose we define a new time variable (a new independent variable) using the formula
(a) Show that dy/ds = y + s.
(b) Find the general solution of the differential equation with the variable s.
(c) What is the general solution of the original differential equation?
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