Exercise 8.3
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Exercise 8.4
$$
\begin{aligned} \dfrac{\partial E_{n}}{\partial W_{kd}} =\sum ^{k}{k=1}\dfrac{\partial E{n}}{\partial y_{k}}\dfrac{\partial y_{k}}{\partial W_{kd}} =\sum ^{k}_{k=1} (y_k - t_k) x_d \end{aligned} $$
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$$
\begin{aligned} \dfrac{\partial E_{n}}{\partial W_{kd}} =\sum ^{k}{k=1}\dfrac{\partial E{n}}{\partial y_{k}}\dfrac{\partial y_{k}}{\partial W_{kd}} =\sum ^{k}_{k=1} (y_k - t_k) x_d \end{aligned} $$
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