unrecognised tex code

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Trying to prettyprint the output of a notebook cell I type this code:

view('$m=\mathrm{rico}\,l=\frac{\Delta y}{\Delta x}=\,'+latex((y2-y1)/(x2-x1))+'$')

I see that AskSage renders the latex code correctly, but in my browser, the \frac command is not recognised and the output looks like

... rac${\Delta y}{\Delta x}$ ...

The fraction generated by the latex()-command however IS rendered correctly.

To be perfectly clear: this is the unrendered code:

view('$m=\mathrm{rico}\,l=\frac{\Delta y}{\Delta x}=\,'+latex((y2-y1)/(x2-x1))+'$')

It seems as if my keyboard codes are misinterpreted. I noticed, e.g., that ':' in a piece of latex code is rendered as '.' - this may be related, or maybe not.

One other question: can I include latex commands such as '\begin{aligned}...\end{aligned}'? (Doesn't work here: \b is not recognised, same as \f).

Oh, and this must be important: latex is flawlessly rendered in TEXT-cells, including the {aligned} environment. It's only in sage-code cells that I experience these problems.