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OpenStudy (anonymous):
(sin168 - sin108)/(cos168+cos108)
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OpenStudy (anonymous):
2.cos(168+108/2).sin(30) / 2.cos(168+108/2).cos(30) sin(30)/cos(30)= tan(30)= 1/[\sqrt{3}\]
OpenStudy (anonymous):
1/sqrt(3)
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