Law of Cosines for Spherical Triangles
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- $\cos a = \cos b \cos c + \sin b \sin c \cos A$
- $\cos A = - \cos B \cos B + \sin B \sin B \cos a$
Also known as
This result is also known as the Spherical Law of Cosines.
This result was first stated by Regiomontanus in his De Triangulis Omnimodus of 1464.