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設Y=(tanx/x)^(1/x^2)同時取對數lnY={ln(tanx/x)}/x^2右邊用洛必達法則得:分子:1/sinxcosx—1/x分母2x化成{x/(2sinxcosx)}*{(x-sinxcosx)/x^3}乘式左右再用羅比達法則得(1/2cos2x){(1-cos2x)/3x^2}=(1/ 2…
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