reciprocal

reciprocal(expr, var)

Return the reciprocal transform of a polynomial in a given variable.

Applies the substitution var → var**(-1) and expands.

Parameters:

• expr (Expr) – SymPy expression.

• var (Symbol | str) – The variable to invert (Symbol or its name).

Returns:

Expr – The transformed expression.

Return type:

Expr