The exsecant is a littleused trigonometric function defined by
(1)

where is the secant.
The exsecant can be extended to the complex plane as illustrated above.
Its derivative is given by
(2)

and its indefinite integral by
(3)

The exsecant is a littleused trigonometric function defined by
(1)

where is the secant.
The exsecant can be extended to the complex plane as illustrated above.
Its derivative is given by
(2)

and its indefinite integral by
(3)

Weisstein, Eric W. "Exsecant." From MathWorldA Wolfram Web Resource. https://mathworld.wolfram.com/Exsecant.html