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OpenStudy (anonymous):
Find the exact value of cos 240°.
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OpenStudy (austinl):
Use a unit circle, it is really easy.
OpenStudy (anonymous):
well cos 240 = cos(180+60) which is cos(180+x), where x is any acute angle. and cos(180+x) = -(cos x) cos 240 is in quadrant 3 so it will be negative. so cos(180+60) = -(cos 60) = - 1/2,
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