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以第一象限為例 設切點為(x1,1/x1)運用導數可知切線斜率為-1/x1的平方.如果不知道導數就用最笨的方法求出切線.囙此過該切點的切線為y-1/x1=-1/x1的平方*(x-x1),於是該切線與直線x=0的交點縱坐標為2/x1 囙此三角形面積為2/x1*x1*1/2=1
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