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Solve using correct symbols used in image: Consider the logistic regression classifier applied to a sample x ( bias feature added ) with correct label

Solve using correct symbols used in image: Consider the logistic regression classifier applied to a sample x(bias feature added) with correct label y using weights vector w(bias
corrected). The forward propagation for calculating the sample's loss is:
z=wTxlongrightarrowa=(z)longrightarrowL=-log(ay(1-a)1-y).
Calculate the gradient of the loss using the chain rule gradw(L)=gradw(z)gradz(a)grada(L) and express it in terms of x,a, and y.
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