Secant
secant
sec
The trig function secant,
written sec θ. sec θ equals 
.
For acute angles, sec θ can
be found by the SOHCAHTOA definition
as shown below on the left. The circle
definition, a generalization of SOHCAHTOA, is shown
below on the right. f(x) = sec x is
a periodic function with period 2π.
See also