Formula:1931

Digital Library of Mathematical Functions ID 4.21.E23

${\displaystyle{\displaystyle\tan\frac{z}{2}=\pm\left(\frac{1-\cos z}{1+\cos z}\right)^{1/2}=\frac{1-\cos z}{\sin z}=\frac{\sin z}{1+\cos z}.}}$

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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