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命题对任何△ABC,有sinAcosB+sinBcosC+sinCcosA≤33~(1/2)/4 (1)当且仅当△ABC为正三角形时等号成立．先看下面的引理
Proposition for any △ABC, there sinAcosB + sinBcosC + sinCcosA ≤ 33 ~ (1/2) / 4 (1) If and only if △ ABC is a positive triangle when the equal sign is established. Look at the following lemma