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how to use certain maxima functions (e.g. ratsubst)?

I cannot figure out how to use maxima functions like ratsubst within sage.

For example: X = maxima('x^2') Now I'd like to substitute x with k. In Maxima, this is done via: X: x^2; ratsubst(k, x, X);

How do I call ratsubst from Sage? If I use X.ratsubst('k', 'x') then it simply prints out 'x'...

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how to use certain maxima functions (e.g. ratsubst)?

I cannot figure out how to use maxima functions like ratsubst within sage.

For example: X = maxima('x^2') Now I'd like to substitute x with k. In Maxima, this is done via: X: x^2; ratsubst(k, x, X);

How do I call ratsubst from Sage? If I use X.ratsubst('k', 'x') then it simply prints out 'x'...