3) cosA cosB cosC$ — — cos2C + — — cosC— cosC 2 730 ( "J T) cosA cosB cosC$0 2 sin2A...

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sms.math.nus.edu.sgsms.math.nus.edu.sg/smsmedley/Vol-23-2/Geometric... · 2012-04-19 · By (3), we have the relation cosA cosB cosC = 4~2 [5 2-(2R + r)]. Therefore ABC is an acute-angled
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