secant |
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| 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.
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