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lim|x趋向于0+ ln(1+2x^2)/x^2 = 2,
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lim(x趋向于无穷大时)cos{ln[1+(2x-1)/x^2]}
lim函数[ln(1/x)]^x(x趋向于0+)的值
求极限 lim(x趋向于无穷大) x{ln(2+1/x)-ln2} 要详解