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\[\lim_{x \rightarrow 3} \frac{ \frac{ 1 }{ x }-\frac{ 1 }{ 3 } }{ x-3 }\]

What have you tried so far?

i know we're supposed to rationalize, but how ? :S

First of all, can you turn \[\frac{1}{x}-\frac{1}{3}\]Into a single fraction?

Remember that \[\frac{a}{b}+\frac{c}{d}=\frac{ad}{bd}+\frac{cb}{bd}=\frac{ad+cb}{bd}\]

i get \[\frac{ 3-x }{ 3x }\]

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