[Localization] acos strings, et al.

[Ed Montgomery]

I'm going to go out on a limb here and take a stab at
a wild guess that:

help_acos  et cetera,

is referring to something regarding help about inverse
math functions, such as arc cosine in the above
example.

So, my guess would be to translate this into something
akin to:

"Help for arc cosine" or perhaps "Arccosine math
help", in whatever your target language is.

Info (in English):
http://en.wikipedia.org/wiki/Arccosine


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