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请教:

Posted by leoyonn at 2005-06-26 01:24:25 on Problem 1045
1.那个相位怎么没有给出条件啊?
2.推倒公式分母有正、余弦,分子正弦,怎么算?
3.好心人帮帮忙啊,怎么推出那种公式~

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