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[函数] 三角最值

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957683999 posted 2014-10-28 12:38 |Read mode
Last edited by hbghlyj 2025-4-23 10:57$\triangle A B C$ 中求 $f(A, B, C)=\sin A \cos ^2 B \cos ^2 C+\sin B \cos ^2 C \cos ^2 A+\sin C \cos ^2 A \cos ^2 B$ 的最值

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kuing posted 2014-10-28 13:15
下确界为0,B=C->90时“取”
最大值遇到四次方程,放弃ing

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kuing posted 2014-11-4 21:20
这道题哪来的,或者有何背景么?

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