Formula:1941

Digital Library of Mathematical Functions ID 4.21.E28

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "TeX input is invalid."): {\displaystyle \cos@{2z}=2\cos^{2}@@{z}-1=1-2\sin^{2}@@{z}=\cos^{2}@@{z}-\sin^{2}@@{z}=\frac{1-\tan^{2}@@{z}}{1+\tan^{2}@@{z}},}

Symbols List

• ${\displaystyle{\displaystyle\cos\NVar{z}}}$: cosine function
• ${\displaystyle{\displaystyle\sin\NVar{z}}}$: sine function
• ${\displaystyle{\displaystyle\tan\NVar{z}}}$: tangent function
• ${\displaystyle{\displaystyle z}}$: complex variable
 

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