回答編集履歴
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test
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@@ -23,3 +23,35 @@
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print(ans)
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```
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関数を列挙しない版。
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```python
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import re
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s = 'y = sgn(A*sin(x1+b))+b*cos(max(x2,xt)+2*b)'
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s = re.sub(r'[a-zA-Z]\w+(', '(', s)
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items = set(filter(None, re.split(r'\W', s)))
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items = [v for v in items if not re.match(r'^[0-9]', v)]
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print(items)
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```
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