The secant function is not defined for odd multipls of 90o.
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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).
90 degrees 90 degrees
90 degrees...
It is: 90-83.5 = 6.5 degrees
rotate it 90 degrees