Question: the term that describes a function that is symmetric about the y-axis is
[{'answer': 'an even function', 'provenance': [{'wikipedia_id': '592151', 'title': 'Even and odd functions', 'start_paragraph_id': 1, 'start_character': 390, 'end_paragraph_id': 1, 'end_character': 406, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '592151', 'title': 'Even and odd functions', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 169, 'bleu_score': 0.742421329721736, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5041996432674960781}, 'section': 'Section::::Definition and examples.:Even functions.\n'}]}]