BackPropagation Derivation Of 2 Layer Neural Network

[Md_Faiz_Alam]

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  Can you please explain how dz[1] got derived ?

[saifkhanengr]

This chain rule:

dZ^{[1]} = \frac{dL}{dZ1} = \frac{dL}{dA2} \times \frac{dA2}{dZ2}\times \frac{dZ2}{dA1}\times \frac{dA1}{dZ1}