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在x趨於0的時候, x,sinx以及tanx都是等價的, 相互之間的比值的極限值都是1, 重要極限 lim(x趨於0)sinx /x=1 應該知道吧, 那麼 tanx=sinx /cosx 所以 lim(x趨於0)tanx /x =lim(x趨於0)(sinx / cosx)/x =lim(x趨於0)sinx /x * 1/cosx代入sinx /x趨於1和cosx趨於1 =1 * 1 =1
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