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[函数] 三角形内的三角恒等式

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guanmo1 Posted 2016-7-12 21:00 |Read mode

三角形内的三角恒等式.png

如图

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kuing Posted 2016-7-12 23:56

只要满足 A+B+C=pi 就成立，不用限制为三角形，更不用非RT

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Author| guanmo1 Posted 2016-7-13 12:19

回复 2# kuing

如何证明呢？

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kuing Posted 2016-7-13 13:09

不用动脑：消A完全展开

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阿鲁 Posted 2016-7-21 01:50

话说，原题是什么？1楼的估计只是解决原题的一个步骤吧？

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