Mathematics Relations and Functions Range of a Function

If \( f:R-\left\{ 2 \right\} \rightarrow R \) is a function defined by \( f(x)=\cfrac { { x }^{ 2 }-4 }{ x-2 } \), then its range is

1
\( R \)
2
\( R-\left\{ 2 \right\} \)
3
\( R-\left\{ 4 \right\} \)
4
\( R-\left\{ -2,2 \right\} \)

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