设A.B.C都是锐角,证明sinA/cosB+sinB/cosC+sinC/cosA小于等于tanA+tanB+tanC
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设A.B.C都是锐角,证明sinA/cosB+sinB/cosC+sinC/cosA小于等于tanA+tanB+tanC
设A.B.C都是锐角,证明sinA/cosB+sinB/cosC+sinC/cosA小于等于tanA+tanB+tanC
设A.B.C都是锐角,证明sinA/cosB+sinB/cosC+sinC/cosA小于等于tanA+tanB+tanC
不妨设A≤B≤C
因为A.B.C都是锐角
所以sinA≤sinB≤sinC,1/cosA≤1/cosB≤cosC
所以sinA/cosB+sinB/cosC+sinC/cosA≤tanA+tanB+tanC
(排序不等式,顺序和大于等于乱序和)