Question: How do I change one variable in a polynomial by an expansion?

Hello!!

 

I have a polynomial where each element is of the form  L * x1^a * x2^b * X3^c *x4^d. I want to replace X3^c by a sum of other elements , the number of this elements depends on c.

 

Is this possible? if so how can I do it on maple?

 

Hope you can help, thanks!

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