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Quiz 7\quad Mar.~23/25, 1993\cr
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1. Compute the Wronskian of the functions $f_1(x) = e^{3x}$ and $f_2(x) = x e^{3x}$.

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2. Given that $y_1 = x^3$ is a solution of
	$$x^2 y'' - 6 y = 0$$
for $x > 0$, find a second linearly independent solution~$y_2$.

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