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\frac{dz}{dt}=xy-bz
\frac{dx}{dt}=-\sigma(x-y)
a^{3}=\frac{R}{K}\left( F+3\pi w R+\sqrt{6\pi RF+(3\pi w R)^{2}} \right)
u_{z}(x,0)=\delta-f(x)\quad (x\le 1)
J(\theta_0, \theta_1) = \frac{1}{2m}\sum_{i=1}^m(h_\theta(x^{(i)})-y^{(i)})^2