The secant of an angle is the reciprocal of the cosine of the angle.
So the secant is not defined whenever the cosine is zero
That is, whenever the angle is a multiple of 180 degrees (or pi radians).
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The secant function is not defined for odd multipls of 90o.
The secant of a circle passes through the center of a circle sometimes
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56, 126,40, 110,and 77, 147.
segment HG A+ls