Medical Radiation Physics - Medical Physics

$\frac{d\left(\frac fg\right)}{dx}(x)=\frac{g(x)\frac{df}{dx}(x)-f(x)\frac{dg}{dx}(x)}{g^2(x)}$

$$ {J(\theta) =\frac{1}{2m} [\sum^m_{i=1}(h_\theta(x^{(i)}) - y^{(i)})2 + \lambda\sum^n_{j=1}\theta^2_j} $$

"PERFECTION IS ACHIEVED NOT WHEN THERE IS NOTHING MORE TO ADD, BUT WHEN THERE IS NOTHING LEFT TO TAKE AWAY. PERFECTION IS ACHIEVED NOT WHEN THERE IS NOTHING MORE TO ADD, BUT WHEN THERE IS NOTHING LEFT TO TAKE AWAY."