Checking to see if answer contains sqrt symbol

I’m looking for a way to check to see if a student used the sqrt symbol. I can check for the value, but want the symbol.

Slide 9 of the following:

I don’t think you can do that, but this should work as a replacement:

a5=this.cellNumericValue(3,3)=9 and countNumberUsage(this.cellContent(3,3),81)=1
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