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- 3) cosA cosB cosC$ — — cos2C + — — cosC— cosC 2 730 ( "J T) cosA cosB cosC$0 2 sin2A...
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3) cosA cosB cosC$ — — cos2C + — — cosC— cosC 2 730 ( "J T) cosA cosB cosC$0 2 sin2A +sin2B + sin2C=2 cosA cosB cosC+2 cosc=— (2)ž.O, (cosÐ)" ... cos sin2A + sin 2B +
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