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重要極限lim(x->0)sinx/x=1 lim(x->0)x/sinx=1 = lim(x->0)1/(sinx/x)=1/1=1 lim(x->∞)x*sin1/x 取t=1/x,則t->0 lim(x->∞)x*sin1/x=lim(t->0)sint/t=1
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