[patch] Fix wrong syntax in documentation (complex.tex and math.tex)

[Agustin Henze]

Hi all,
       I've found some wrong syntaxes in the documentation, specifically in the
files (complex.tex and math.tex). I've attached a patch that fix this. Please
take a look and if you think that it's all fine apply it.

Cheers,

-- 
TiN
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