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posted by Ian Saturday, December 11, 2010 at 2:24am.
Use the Reference Angle Theorem to find the exact value of sec(13 pi/6).
sec(13pi/6) = sec((13p1/6)*180/pi) = sec(390 deg) = sec(390 - 360) = 30 deg, sec(30 deg) = 2(sqrt3) / 3.
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