In this case, if the answer was arctan (3/4) there wouldn't be a pi in the answer, and so hardwiring the pi is a bad idea. In this case I would want them to enter arctan (3/4) as the exact answer (or arctan (0.75) = arctan (6/8)).
PREP 2014 Question Authoring - Archived
Exactness: student answers and display of expressions
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