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-3 ≤ cosA+cosB+cosC ≤ 3/2
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提:A + B + C = π 若限制 A, B, C ≥ 0,則 1 ≤ cosA+cosB+cosC ≤ 3/2
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