Editor
If $y=3x^{2}+2x-\frac{4}{x^{2}}$, then dy/dx equals:
Difficulty: Easy
A: 
$x^{3}+x^{2}-\frac{4}{x}$
B: 
$x^{3}+x^{2}+\frac{4}{x}$
C: 
$6x+2+\frac{8}{x^{3}}$
D: 
$6x+2+\frac{8}{x}$
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