In a triangle $ABC$, we use the standard convention:
Cosine rule
A formula for any triangle that relates a side length to the other two side lengths and the cosine of the included angle. For triangle $ABC$: $a^{2}=b^{2}+c^{2}-2bc\cos A$ (and similarly for $b$ and $c$).
The cosine rule has three equivalent versions:
$$a^{2} = b^{2}+c^{2}-2bc\cos A $$
$$b^{2} = a^{2}+c^{2}-2ac\cos B$$
$$c^{2} = a^{2}+b^{2}-2ab\cos C$$
Pick the version where:
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