Formula:1947

Digital Library of Mathematical Functions ID 4.21.E31

${\displaystyle{\displaystyle\cos\left(3z\right)=-3\cos z+4{\cos^{3}}z,}}$

Symbols List

• ${\displaystyle{\displaystyle\cos\NVar{z}}}$: cosine function
• ${\displaystyle{\displaystyle z}}$: complex variable
 

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