# Trigonometry

Find all solutions of the equation in the interval [0,2pi).

sec(theta)+2=0

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1. sec x = -2, so
cos x = -1/2
solutions in QII and QIII

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2. how do I write this in radians in radians in terms of pi

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3. c'mon, guy.

cos π/3 = 1/2, so

cos 2π/3 = cos 4π/3 = -1/2

x = 2π/3 or 4π/3

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