**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**

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