DLMF:4.21.E33

MaRDI QIDQ1951

• Label: DLMF:4.21.E33

Digital Library of Mathematical Functions ID 4.21.E33

${\displaystyle{\displaystyle\cos\left(4z\right)=8{\cos^{4}}z-8{\cos^{2}}z+1.}}$

Symbols List

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

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