Unescaped slashes in Checkit strings

[siwelwerd]

Seeing this in the build output, I think this is all precalculus:

<string>:33: DeprecationWarning: invalid escape sequence '\i'
<string>:33: DeprecationWarning: invalid escape sequence '\i'
<string>:1[8](https://github.com/TeamBasedInquiryLearning/library/actions/runs/12891520081/job/35943648758#step:7:9): DeprecationWarning: invalid escape sequence '\l'
<string>:35: DeprecationWarning: invalid escape sequence '\c'
<string>:4[9](https://github.com/TeamBasedInquiryLearning/library/actions/runs/12891520081/job/35943648758#step:7:10): DeprecationWarning: invalid escape sequence '\l'
<string>:69: DeprecationWarning: invalid escape sequence '\c'

I believe the first one, for example, is caused by this line

library/source/precalculus/exercises/outcomes/EL/EL4/generator.sage

Line 32 in a0c531f

"domain": f"(-\infty,{c})" if reflection=="horizontal" else f"({c},\infty)",

Note the unescaped \ in the string. Fix should be to escape the slashes.

[siwelwerd]

I think this is the \ls

library/source/precalculus/exercises/outcomes/EL/EL7/generator.sage

Line 17 in a0c531f

"f": f"A({variable})=P\left(1+\dfrac{{r}}{{n}}\\right)^{{ n{variable} }}",

library/source/precalculus/exercises/outcomes/EL/EL7/generator.sage

Line 48 in a0c531f

"f": f"A({variable})=A\left(1-r\\right)^{{ {variable} }}",

And these are teh \cs

library/source/precalculus/exercises/outcomes/EL/EL7/generator.sage

Line 34 in a0c531f

"f": f"P({variable})=a\cdot b^{variable}",

library/source/precalculus/exercises/outcomes/EL/EL7/generator.sage

Line 68 in a0c531f

"f": f"A({variable})=A\cdot \\left(\\frac{{1}}{{2}}\\right)^{{\\left( \\frac{{ {variable} }}{{h}} \\right)}}",