I plot both ln(|x|) and 1/x on the same graph and try to label them by

t1=text('$\frac{1}{x}$', (1,4), fontsize=14, rgbcolor='red');
t2=text('$\ln(|x|)$', (1,5), fontsize=14)

While SAGE understand perfectly what to do with \ln, it doesn't seem
to know what to do with \frac:
it complaints

Traceback (click to the left for traceback)
...
$ rac{1}{x}$ (at char 0), (line:1, col:1)

why? it looks like \f means something...

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