xlink:href="https://static.igem.org/mediawiki/2014/8/89/ETH_Zurich_TF_LuxQSModel.jpg" /> $$c = \pm\sqrt{a^2 + b^2}$$ $$c = \pm\sqrt{a^2 + b^2}$$ $$c = \pm\sqrt{a^2 + b^2}$$
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