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OpenStudy (anonymous):
Find all solutions to the equation. cos x = -1/2
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OpenStudy (anonymous):
OpenStudy (anonymous):
@hartnn
hartnn (hartnn):
for which angle is cos value = -1/2 can you find ? you have a unit circle with you ?
OpenStudy (anonymous):
2pi/3
hartnn (hartnn):
http://en.wikipedia.org/wiki/File:Unit_circle_angles_color.svg yes, 2pi/3 and one more angle ?
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OpenStudy (anonymous):
4pi/3??
OpenStudy (anonymous):
So it would be D?
hartnn (hartnn):
yes! and correct! ist D :)
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