I don’t really know. But I think this forum does not support MathJax. It would be nice if it did. 
Test 1: $a$.
Test 2: [a].
Test 3: $$a$$.
Test 4: (a).
Done. You need to edit your post for it to update the display format
Test 1: a.
Test 2: [a].
Test 3:
a
Test 4: (a).
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