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[不等式] 一个三角有关的等式

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lemondian posted 2022-4-9 20:40 |Read mode
Last edited by lemondian 2022-4-9 21:35已知锐角$\alpha ,\beta $满足:$\frac{\sin^5\alpha }{\sin^3\beta }+\frac{\cos^5\alpha }{\cos^3\beta }=1$,求证:$\frac{\sin^5\beta }{\sin^3\alpha }+\frac{\cos^5\beta  }{\cos^3\alpha  }=1$。
我用权方和不等式证到了,看看大家有没有其它证法。

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kuing posted 2022-4-9 22:54

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original poster lemondian posted 2022-4-9 23:51
回复 2# kuing
N呀

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original poster lemondian posted 2022-4-15 11:09
回复 2# kuing
请问kuing:
forum.php?mod=viewthread&tid=4257
此贴中的三角式子是否有最大值?

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