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If $y=\frac{x^{4}+x}{x^{2}}$ then dy/dx equals:
Difficulty: Easy
A: 
$4x^{5}+\frac{1}{x^{3}}$
B: 
$\frac{2x^{3}+1}{x^{2}}$
C: 
$2x-\frac{1}{x^{2}}$
D: 
2x
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