Question: Is this a Bug? 2-D math input

Hi all,

I am now helping with the first year maple session in my university. Recently, some of the student are learning both 1-d and 2-d input.

Now we have something like this:

 

Is this some sort of bug?

I know it has something to do with the 1-d or 2-d or math input, but in short, that's what happens.

Thanks!

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