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$$\frac{1}{2}\sum_{i=1}^{N}\left(y\left(x_{i};w\right) - t_{i}\right)^{2} + \frac{\lambda}{2} \lVert w \rVert^2 $$
## Starting from the unregularized sum of squares error of a linear regression model,show how the explicit solution can be obtained, assuming (X T X) is regular.