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OpenStudy (anonymous):
How can I tell if cos 2π/3 is a 30,60,90 triangle or a 45,45,90 triangle?
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OpenStudy (anonymous):
thats a bit weird on wording, but convert the angle from radians to degrees, and you should have your answer
OpenStudy (anonymous):
actually, i don't think that will give you what you need.. the angle doesn't match any of your triangles, and the value of cos (2pi/3) is negative, did you write the question correctly?
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