DLMF:4.21.E29 (Q1731): Difference between revisions

Revision as of 18:26, 1 January 2020

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Language	Label	Description	Also known as
English	DLMF:4.21.E29	No description defined

{\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}.}}

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DLMF:4.21.E29

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{\displaystyle{\displaystyle\cot\NVar{z}}}

C4.S14.E7.m2acdec

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@@ Property / Symbols used @@
+cotangent function
@@ Property / Symbols used: cotangent function / rank @@
+Normal rank
@@ Property / Symbols used: cotangent function / qualifier @@
+Defining formula:  ${\displaystyle{\displaystyle\cot\NVar{z}}}$ 
\cot@@{\NVar{z}}
@@ Property / Symbols used: cotangent function / qualifier @@
+xml-id: C4.S14.E7.m2acdec