A nice web page suggests to write

**lim{x->0}sin(x)/x = 1**

This is an unambiguous expression. Alternatively, you can use "LaTeX" commands:

**\lim_{x\rigtharrow 0}\sin(x)/x = 1**

How about the following?

I suggest to use "matlab like" expression:

**inv([a,b;c,d]) = 1/(ad-bc)[d,-b;-c,a]**

This wil be unambiguous

*if the other person also knows matlab commands*.
If you want to write so complicated mathematical expression as those in the cubic formula, I suggest to make a PDF file and just attach it!

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