Asked by rosie

Solve the equation 2cos(x)+1=0,0≤x≤2π0≤x≤2π. Show all of your work.
Answered by oobleck
you have cosx = -1/2,
your reference angle is π/3
That means there is a solution in QII and QII, where cosx is negative
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Answered by rosie
would it be 120 degrees
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