The denom or getDenom command finds the denominator of a fraction.
| denom(42/12) | 
or:
| getDenom(42/12) | 
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To avoid simplification, the argument must be quoted (see Section 9.1.4).
(For rational expressions see Section 11.6.3).
| denom('42/12') | 
or:
| getDenom('42/12') | 
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