Limit Definition of the Derivative
If $$ f(x) = \frac{1}{x} $$, then $$ \lim_{x \to 1} \frac{f(x) - f(1)}{x - 1} = $$
A
$$ 1 $$
B
$$ -1 $$
C
nonexistent
D
$$ 0 $$
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