<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
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$\theta_i = \theta_i - \alpha\frac\partial{\partial\theta_i}J(\theta)$
$\theta_i = \theta_i - \alpha\frac\partial{\partial\theta_i}J(\theta)$
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