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OpenStudy (anonymous):
solve cosx=-1/2 if 0 degrees <= x<=360 degrees
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OpenStudy (anonymous):
@Directrix
OpenStudy (anonymous):
Directrix (directrix):
The cosine function is negative in Quadrants II and III because that is where x is negative. The reference angle is 60 because cosine of 60 degrees = 1/2. With that info, see if you can find the two angles that satisfy the dictates of the stated problem.
Directrix (directrix):
Okay, I see the marked answer you posted. Yes, I concur with your answers.
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