DLMF:19.11#Ex4
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Math Formula Information
Formula: Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \tan@{\tfrac{1}{2}\psi}=\frac{(\sin@@{\theta})\Delta(\phi)+(\sin@@{\phi})\Delta(\theta)}{\cos@@{\theta}+\cos@@{\phi}}.}
Name: DLMF:19.11#Ex4
Description:
Data Source
https://lct.wmflabs.org/w/index.php?title=Special:EntityPage/Q6276