Bestimme die Ableitungen ∂ ∂ z {\displaystyle {}{\frac {\partial }{\partial z}}} und ∂ ∂ z ¯ {\displaystyle {}{\frac {\partial }{\partial {\overline {z}}}}} von f ( z ) = z a z ¯ b {\displaystyle {}f(z)=z^{a}{\overline {z}}^{b}} .