※ 引述《renkin0904 (小皓)》之銘言：
: 求各極限值
: lim ｘ
: (兀-x)tan－－
: x->兀 ２
L'Hopital Rule
l i m (兀-x)sin(x/2)
= --------------
x->兀 cos(x/2)
l i m -1
= --------------- = 2
x->兀 -(1/2)sin(x/2)
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