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secant (trig function)

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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