If you are writing a math "calculated formula" question you can only use English (no math equations) with variables.
For instance if you want to ask:
You cannot use the formula editor to do it, instead you would have to writ the question:
What is the square root of [x]?
That kind of works even though it doesn't look good, but what if your question is:
Are you really going to make the question:
What is the cube root of [x] minus the absolute value of [y] raised to the power of 1/3?
So I think we need to find a way for Blackboard to recognize a variable within a Wiris formula.
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