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按图索骥
xiazhi
(坐井说天阔)
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(#16069851@0)
Last Updated: 4-26
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这里高人多,娃有道考试题,有人指点一下吗?如何证明log(b/a) = (cos2a-cos2b) + (1/2)*(cos4a+cos4b)
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