Editor
Find the eccentricity of the hyperbola $\frac{x^{2}}{4}-\frac{y^{2}}{9}=1$
Difficulty: Easy
A: 
$\frac{3}{2}$
B: 
$\sqrt{13}$
C: 
$\frac {\sqrt{13}}{2}$
D: 
$\frac{4}{9}$
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