Editor
$\int \frac{dx}{x^{2}-9}$ is equal to:
Difficulty: Easy
A: 
$\frac{1}{3}ln|\frac{x+3}{x-3}|$
B: 
$\frac{1}{a}ln|\frac{x-3}{x+3}|$
C: 
$\frac{1}{6}ln|\frac{x+3}{x-3}|$
D: 
$\frac{1}{6}ln|\frac{x-3}{x+3}|$
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