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  • https://math.libretexts.org/Bookshelves/Analysis/Tasty_Bits_of_Several_Complex_Variables_(Lebl)/01%3A_Holomorphic_Functions_in_Several_Variables/1.03%3A_Derivatives
    Using the standard chain rule, \[\begin{align}\begin{aligned} \frac{\partial}{\partial z_j} \left[ g \circ f \right] & = \frac{1}{2} \left( \frac{\partial}{\partial x_j} - i \frac{\partial}{\partial y...Using the standard chain rule, \[\begin{align}\begin{aligned} \frac{\partial}{\partial z_j} \left[ g \circ f \right] & = \frac{1}{2} \left( \frac{\partial}{\partial x_j} - i \frac{\partial}{\partial y_j} \right) \left[ g \circ f \right] \\ & = \frac{1}{2} \sum_{\ell=1}^m \left( \frac{\partial g}{\partial s_\ell} \frac{\partial u_\ell}{\partial x_j} + \frac{\partial g}{\partial t_\ell} \frac{\partial v_\ell}{\partial x_j} - i \left( \frac{\partial g}{\partial s_\ell} \frac{\partial u_\ell}{\part…

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