| lim x  0 | f(x). |
First, look on the x-axis, and notice that x is approaching 0 from the left, thus we are talking about
| lim x 0 | f(x). |
Next, look on the y-axis, and notice that y is approaching 
1 as x approaches 0 (from the left). Therefore,
| lim x 0 | f(x) = 1. |
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