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[函数] 三锐角余弦平方和为1

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guanmo1 posted 2018-2-23 12:19 |Read mode
三锐角余弦平方和为1.JPG

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色k posted 2018-2-23 12:39
见《撸题集》第 173 页题目 2.1.27
或者参考 forum.php?mod=viewthread&tid=4725

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