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不知你學過泰勒展開式沒有,幂級數展開的等價無窮小的方法,求這類極限是最容易的了. tanx~x,這兩個是等價無窮小. tan3x~3x, 同樣的,有: sinx~x,sin4x~4x. 那麼:tan3x/sin4x與3x/4x有相同的極限3/4
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