[This I Wonder32460]

English please, I don’t speak math.
Math is a language don’t you know?

[Oztrich Boy]

First of all it's "maths". Math. would be the abbreviation of mathematics, but then people might think you had written a one word sentence and then not capitalized the first word of the next. Maths being a contraction of mathematics requires no period.

And as The people have spoken caught on, that mathematical expression is a pune, or play on words, of "cosign this"