Secant is a trignometric function. In a right triangle, the secant of an angle is the hypotenuse over the adjacent side.
It is also the inverse of cosine. For example secant(x) = 1/cos(x)
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The tangent secant angle is the angle between the tangent to a circle and the secant, when the latter is extended.
A secant line is a line that cuts a circle in two places.
Secant is a straight line that intersects a curve at two or more points