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
Inverse secant, angle
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