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應為m^2+1所對的角 m^2+1>m^2-1這個總知道吧 (m-1)^2≥0,m^2-2m+1≥0,m^2+1≥2m 可以看到m^2+1大於或等於任其它兩邊 而三角形中越長的變邊所對的角越大 所以m^2+1所對的角最大
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