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超級簡單啊(上下導數相除) limtan∏x/(1-x)=lim(tan(∏x))'/lim(1-x)' (tan(∏x))'/(1-x)'=(∏/cos^2(∏x)/(-1)=-∏/cos^2(∏x)當x趨於1時, limtan∏x/(1-x)=lim(tan(∏x))'/lim(1-x)'=-∏
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