Let p(z) = a0 + a1z + .... + anzn and q(z) = b1z + b2z2 + .... + bnzn be complex polynomials. If a0, b1 are non-zero complex numbers then the residue of \(\frac{p(z)}{q(z)}\) at 0 is equal to
1
\(\frac{a_{0}}{b_{1}}\)
2
\(\frac{b_{1}}{a_{0}}\)
3
\(\frac{a_{1}}{b_{1}}\)
4
\(\frac{a_{0}}{a_{1}}\)