The exsecant is a little-used trigonometric function defined by
 |
where 
is the cosecant.
Excosecant
See also
Covercosine, Coversine, Exsecant, Hacovercosine, Hacoversine, Havercosine, Haversine, Vercosine, VersineExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Excosecant." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Excosecant.html