The indicated function $y_1(x)$ is a solution of the given differential equation. Use reduction of order or formula (5) in Section 4.2,
$y_2 = y_1(x) \int \frac{e^{-\int P(x) dx}}{y_1^2(x)} dx$ (5)
as instructed, to find a second solution $y_2(x)$.
$25y'' - 60y' + 36y = 0$; $y_1 = e^{6x/5}$
$y_2 = $