I am almost positive that it isn't because a secant is an extended chord so it goes out of circle. So no it is not.
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a secant is a line containing a chord. A secant is a line that intersects the circle twice(or passes through a circle)
The chord that passes through the center of a circle is called the diameter. The measure of this chord is also called the diameter, and is used in calculations such as finding the circumference of a circle (Circumference equals pi times the diameter).^^wrong...it is eitherSecant or tangent im pretty sure its SECANT though...
Cosine.
Substitute secant(x)=1/cos(x) into your equation, and you should be able to solve from there.
2*Pi