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$\frac{\text{d}}{\text{d}x}(\frac{f(x)}{g(x)})$=
Difficulty: Easy
A: 
$\frac{f'(x)g(x)-f(x)g'(x)}{[g(x)]^{2}}$
B: 
$\frac{g'(x)f(x)-f'(x)g(x)}{[f(x)]^{2}}$
C: 
f'(x)+g'(x)
D: 
$\frac{f'(x)+g'(x)}{[g'(x)]^{2}}$
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