10.8.12 Series with complex terms
Condition: Find all Laurent expansions of this function in powers \( z \) : \[ \frac{7 z+98}{49 z+7 z^{2}-2 z^{3}} \]
Expansion of complex functions in Laurent and Taylor series. Both single-valued and multi-valued functions are considered, indicating the branches along which the multi-valued functions are taken.