DLMF:4.21.E42
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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 |\cos@@{z}|=(\cos^{2}@@{x}+\sinh^{2}@@{y})^{1/2}=\left(\tfrac{1}{2}(\cosh@{2y}+\cos@{2x})\right)^{1/2},}
Name: DLMF:4.21.E42
Description:
Data Source
https://lct.wmflabs.org/w/index.php?title=Special:EntityPage/Q1746