Mathematica has the ability to do pattern matching such as:
Int[cos[a_.+b_.*x_], x_Symbol] := Sin[a+b*x] / b /; FreeQ[{a, b}, x]
Here *a* and *b* are matched if they do not contain *x*.
As far as I know, SymPy is unable to perform such a match. Are there any
ideas to extend the pattern matching algorithm?
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