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ZW、W=cosα+isinα、1/W=cosα-isinα、 したがって、z/a+a/z=(a)*(cosα+isinα)+(a/3)*(cosα-isinα) =(a+a/3)*cosα+i(a-a/3)sinα z/a+a/zは実数であるため、sinα=0 Zは虚数、sinα=0、a-a/3=0なので、a=±3
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