DLMF:4.42.E12

MaRDI QIDQ2481

• Label: DLMF:4.42.E12

Digital Library of Mathematical Functions ID 4.42.E12

${\displaystyle{\displaystyle\cos A=-\cos B\cos C+\sin B\sin C\cos a.}}$

Symbols List

• ${\displaystyle{\displaystyle\cos\NVar{z}}}$: cosine function
• ${\displaystyle{\displaystyle\sin\NVar{z}}}$: sine function
• ${\displaystyle{\displaystyle A}}$: angle
• ${\displaystyle{\displaystyle B}}$: angle
• ${\displaystyle{\displaystyle C}}$: angle
• ${\displaystyle{\displaystyle a}}$: arc length
 

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