the expected result = 0. symmath_check() was dividing a quantity by the expected result, leading to a NaN value that caused the answer to be marked incorrect. Added test_symmath_check.py with basic tests for the symmath_check() function.
the expected result = 0. symmath_check() was dividing a quantity by the expected result, leading to a NaN value that caused the answer to be marked incorrect. Added test_symmath_check.py with basic tests for the symmath_check() function.