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$\cos\gamma=\frac{a^{2}+c^{2}-b^{2}}{2ac}$
$\cos\gamma=\frac{a^{2}+c^{2}-b^{2}}{2ac}$
$\cos\gamma=\frac{a^{2}+c^{2}+2ab\cos\gamma}{b^{2}}$
$\cos\gamma=\frac{b^{2}+c^{2}-a^{2}}{2bc}$