Editor
If $f(x)=x-\frac{1}{x}$ then f'(x)=
Difficulty: Easy
A: 
$\frac{1}{x^{2}}$
B: 
1
C: 
$1-\frac{1}{x^{2}}$
D: 
$1+\frac{1}{x^{2}}$
Sponsored Ads