college math

Use the Reference Angle Theorem to find the exact value of sec(13 pi/6).

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asked by Ian
  1. 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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    posted by Henry

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