Formula:1943

Digital Library of Mathematical Functions ID 4.21.E29

${\displaystyle{\displaystyle\tan\left(2z\right)=\frac{2\tan z}{1-{\tan^{2}}z}=\frac{2\cot z}{{\cot^{2}}z-1}=\frac{2}{\cot z-\tan z}.}}$

Symbols List

• ${\displaystyle{\displaystyle\cot\NVar{z}}}$: cotangent function
• ${\displaystyle{\displaystyle\tan\NVar{z}}}$: tangent function
• ${\displaystyle{\displaystyle z}}$: complex variable
 

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